You're post shows it's a similar analogy. The iphone is touted as ip68 water resistance. This is not the same as water proof. IP68 is a step up from what some iphones are, which is ip67.Not the same thing. It’s a stronger glass, not an unbreakable glass, and it’s not sold as unbreakable, only more resistant to drops than previous phones. Yet they claim an ip68 water resistance, then refuse to repair water damage.
Just like stronger glass doesn't mean the phones won't shatter if dropped, better water resistance doesn't mean total absence of ingress from liquids when submerged.