Who ordained him a bishop?
I'm not sure, but the Baptist church in Georgia has quite a long and complicated history. When the Georgian Church was forcefully subordinated to the Patriarchate of Moscow, the alternative for many who resisted was the Baptist church, rather than an Orthodox resistance group a la ROCOR. Thus, it should be seen more as a social organisation than one defined by its adherence to Baptis theology or practice, as is exemplified by the beards, robes, iconography, liturgy, episcopacy, etc. In essence they're extreme ecumenists - they incorporate a little bit of everything.
'Bishop' Malkhaz (holding the mic) with the other 'bishops' from their church in Tbilisi. Lovely people if nothing else: