I'll probably get banned for asking this question, but here goes.
How can some still believe he is a true pope?
I don't think you'll get banned for that question. So why do I think he's true Pope? Well, as I said a few days ago, there are Popes and there are anti-popes, no in-between. This could have been stuff that he wrote or said before he even became Pope. I still don't think he meets enough criteria to be named anti-pope. Is he a Traditional Pope? No. Is he what I would call a good Pope? No. However, I don't think he's an anti-pope.
But if he held Heretical Views prior - then his election is invalid. A heretic cannot be elected Pope as he is not a member of the Church