Are you saying the GOC knew about his way of life as it was reported some time ago?
When Fr. Paisios came to the USA in 1971, he was assigned as the chancellor to Bishop Petros at St. Markella's. Bishop Petros found a letter that Paisios received from Greece indicating that Paisios had a daughter outside of wedlock. Technically, someone who has relations outside marriage cannot be ordained a priest, although economia is used all the time on this one in our modern age. Given that he was tonsured a monk, that tends to be a "reset" in the minds of many church authorities as well. However, Bishop Petros did not trust him, so he asked him to go back to Greece.
Fr. Paisios did not take too kindly to that, and started ministering as a "freelancer" to raise money. He then built St. Irene's about 3/4 of a mile from St. Markella's. You can literally walk from St. Markella's to St. Irene's in 7-8 minutes. He took advantage of Bishop Petros's split from the GOC Synod in 1974 (see my book for more on that)
and was able to be under the archbishop, since Bishop Petros was suspended from the Synod (for not signing the Encylical of 1974).
I do not know much about how his evil ways developed, but it seems that Fr. Paisios progressed in his sin, and gained connections with a well known group of Italian businessmen engaged in territorial enterprises (I'm not going to talk about that for obvious reasons), and began at some point to increase the wantonness of his sexual proclivities. The GOC heard things, but no one ever stepped forward to make a case against him.
In 1985, the former Archbishop Auxentios was deposed for canonical wackiness and replaced with the blessed Archbishop Chrysostomos II (+2010) who cleaned up shop. He tolerated the presence of by-then Metropolitan Paisios on the Synod for reasons of unity, but they were always looking for a way to keep him in check. Metropolitan Petros of Astoria concelebrated with Metropolitan Paisios two times after his reunion with the GOC Synod in 1985...once at each cathedral...but that was it.
In 1995, Met. Paisios was one of six bishops who left the GOC over property disputes, and for no good theological reasons. 2 immediately repented and returned, 2 stayed separate, and then Paisios and Vikentios formed an independent American Synod. It fell apart, and they approached the Ecumenical Patriarchate. I was told by more than one individual that they paid the EP $100,000 to be received as bishops...that figure may account for the value of the property they handed over to the EP or it may have been a cash payment. I cannot substantiate this charge publicly, which may lead to the charge that I am posting unsubstantiated rumors, a violation of forum rules, but I will make the argument that in my capacity as a researcher/journalist, two priest sources (one in the GOC, and one in the OCA) confirmed this to me and I believe them, so I am protected from revealing my sources due to the context in which I obtained the information.
To cut to the chase, we did in fact warn the EP numerous times not to do what they were doing. No one cared. They wanted that property and they wanted to claim that they had "healed" the Old Calendar schism. That is the propaganda that was passed around. People started showing up at St. Markella's on the new calendar feast day after Met. Paisios told everyone in Astoria that there were no longer any Old Calendarists in America!
When Bishop Vikentios got mad at Met. Paisios and revealed all the dirty details he could in a public fight reminiscent of a breakup, it led to everything unraveling and the nun (a different nun) going to the police with the suitcase full of gold coins and cash totaling $500,000. People came forth and reported that Met. Paisios had done horrible sexual things. They tried to punish Bp. Vikentios by making him Metropolitan of Imbros and Tenedos (which if anyone knows anything about that island, is one where the Turks routinely firebomb cemeteries and attack the churches on the island--sounds like the EP was hoping he would get "taken care of" if sent there...) All of this is so disgusting and sickening. And it could have ALL been avoided.