I'm not going to bet on it but if I had to I would bet that he will indeed set up the strategic reserve. You can't trust a politician's promise but in this case he has appointed a lot of people around him who are pro-bitcoin, plus the recent sale of bitcoins, reducing the number that the stockpile would have, I think would be another catalyst that motivates him to create it.
we already heard Trump criticized Bitcoin in the past, calling it risky and not real money.

Well, I guess it's not the first time Trump has said one thing and then changed his mind, but especially with bitcoin this is relatively frequent.
5 billionaires who publicly hated crypto then changed their mindsThis is just a sample, as the article does not include Michael Saylor, for example.