I checked and couldn't find anything that would confirm them being guys, hence my question.
For TKNS, in this tweet, he uses the hashtags #可爱的男孩子 #偽娘 #男の娘 which are "cute boy", "trap", otoko no ko". For cai, in this tweet, he shows a picture of himself from 2020. Also he talks about crossdressing in some other tweets while wearing a lolita dress.