Is this rage-bait? A language alone doesn't dictate reliability. There are tons of large scale systems out there running on Python. As for the language being, "flawed irreversibly", I'd be curious to hear you expand on that with examples.
Nobody would claim that. But are you trying to say that the language has no effect on reliability? Because that's obviously nonsense.
Language choice has some effect on reliability, and I would say Python's effect is mediocre-to-bad. Depending on if you use Pyright. Not too bad if you do. Pretty awful if you don't.