Most are but some are just good sticks that Mike sourced through his contacts and stickered up for customers if they wanted...
I have not seen this being mentioned when Talisman bats were resold on the forum. Maybe other members were more aware than I was.
It's not something, to my knowledge, that has ever been hidden. Like I said, most (90%+) bats with stickers are TK made but some are sourced elsewhere and Mike applied some stickers if the buyer asked him to. Most of the time he would sell them blank though...