It's upto. Just bargain better and you can get cheaper.
It's IP67. Never tried that pressure sensor test on iPhones, but on Androids, its reasonably accurate but not a guarantee. Most iPhones, even older ones had some secret water resistance btw.
On android, pressure test works somehow on normal sealed (non water resistant) sets too, if you press its display or back, pressure rises. So don't get fooled. Lol.
But checking screws and other visual inspection clearly shows that's if set is sealed or not. Sealed set should have its water resistance seals intact.