No, given that the OP was discussing a factory disaster in Bangladesh where 50% of the population is illiterate and only 18% even speak English, making it highly unlikely that someone in a sweatshop would know how to spell "degrading".
This very objection that someone possibly from England might have carefully printed the label and attached it to the clothing either before or after purchase was raised by the link provided in the OP. How would they prove this assumption?
Careful forensics would be needed to study the label in order to determine pollen content (country of origin).
* If the tape on which the message was embroidered were to be determined to have come from that factory, then that evidence would be damning.
* On the other hand, with world trade, that plain white tape might have been manufactured in China for import to Bangladesh, as the Chinese have their own slave labor camps. China has been known for using political prisoners in their sweat shops.
The embroidery thread used also needs to be studied.
* Where was it originally made?
* Was there any DNA tissue on it or small blood stains from a needle puncture that could determine the ethnicity of the seamstress or tailor?
On the one hand, there are many opportunities that unscrupulous people could use.
On the other hand, perhaps a supervisor at the sweat shop added the label in a silent cry for help.
Examine the purchaser. Was this tape or garment worn or washed by the purchaser?
* If so, use of water, detergent or dry cleaning fluids could have contaminated any evidence.
* If these garments were dry cleaned, perhaps an employee of the dry cleaner shop could have added the label.
Notice that the garment label was not immediately discovered by the purchasers, who apparently kept these garments in their possession for almost a year. However, I have known some women who have purchased a garment, put it away in their closets, and then have all together forgotten about it, so it might not have been worn at all.