It apparently is, but it was so pixelated it looked like it could be Chinese or Japanese, and those posts are much more common than posts about Korea.
Someone posted a higher res image elsewhere, so I transcribed the Hangul and ran it through Google translate, in case anyone is interested: https://sh.itjust.works/comment/15943722
That all looks like Hangul to me.
It apparently is, but it was so pixelated it looked like it could be Chinese or Japanese, and those posts are much more common than posts about Korea.
Someone posted a higher res image elsewhere, so I transcribed the Hangul and ran it through Google translate, in case anyone is interested: https://sh.itjust.works/comment/15943722