Has he genuinely shown signs of being the next Hamilton/Max
Yes, comfortably, although he hasn't proved it at a higher level yet. In single seaters, he's won
every full season he's taken part in. He did half a season of Italian F4 in 2021 then absolutely smashed it in 2022, winning 13 races out of 20, and taking the ADAC F4 the same year despite missing a race weekend. In that one he won 9 of 15 races he entered. Then he went to Formula Regional where he won both the Middle East and the European championships in 2023. Four championship wins in two years. That's mighty.
In F2, things aren't going to so well, but then he's the youngest driver on the grid and skipped F3 entirely. He's still managing to outclass Oli Bearman in the same team, and he's always scored as least as much as the weekend before each race, showing signs of consistent improvement rare on the F2 grid.
Personally, I think if he doesn't win F2 this year (which he still might) then it would probably be better for him to stay there for another season. On the other hand, a quick promotion will give him a chance to find his feet and learn the tracks before the new rules kick in.