Just for the sake of transparency, one advanced stats site has Hellebuyck not-top-1 in GSAx. He's 1st in the other public ones. In the one he isn't, he's 2 GSAx below the leader.
What in the world are you talking about? Are you just making shit up hoping that no one double checks what you're saying?
In the "few years" 2020-2023 where he didn't have a great defense around him, he finished top 4 in Vezina voting 3 of those seasons. He won in 2020, finished 4th in 2021 (where he also led the league in GSAx per moneypuck, second per evolving hockey), had a mediocre season in 2022 (save percentage just above average, which is mediocre for him), and finished 3rd in 2023.
This was while having the heaviest workload of any goalie in the NHL.
The 2020 season was a shining example of your claim about his being propped up by a great defense was absolute nonsense. The other two seasons where he finished top 5 in Vezina voting behind one of the worst defenses in the league just add on to how what you're claiming is baseless nonsense.
Yes, the Jets have a good defense now, which is probably part of the reason why Hellebuyck's save percentage compared to the league average rivals prime Hasek. If you put an elite goaltender behind a great defense, he's going to lap the field. When he was behind an atrocious defense in 2020 and 2021, he finished first in the league in GSAx and finished 1st and 4th in Vezina voting.