Not at all, if it’s kosher it’s ok with me…
I’ve purchased fake vegan kosher pepperoni and added it to my pizza before…I kind of liked it…
If (and I stress the if; I’m not certain) there is an issue of maris ayin, then it would not be kosher.
The ??”? ??”? ?”? clearly says that meat served (he probably means cooked) in almond milk is assur unless almonds are placed in the “milk”.
Unless there are visible bits of soy in the cheese, why would the same issue not apply?
I don’t know what “fake vegan kosher pepperoni” looks like to know if there would be maris ayin on it. One could argue that the issur is only on fake dairy not fake meat, by I personally don’t see an important distinction there.
The prevalent heter for margarine, soymilk, pareve ice cream, etc. seems to be that these items are more common today than almond milk was in the days of the R”ma. I don’t know if this is true or not (??”? writes “?????“), but I find it unlikely that fake cheese is. The ??? ????? seems to be uncertain of this entire heter anyhow.