How can this phone be called water resistance? I just went to the genius bar I was told that even though the iPhone XS Max maximum depth of 2 meters up to 30 minutes, it is not covered under warranty for water damage?

You need to read the fine print. Every description (even the ads where stuff is sprayed or dropped) comes with disclaimers that liquid damage isn’t covered by the warranty.

The water resistance is also only describing a laboratory standard. Maybe it can take it once. They certainly don’t design it for multiple exposure to liquid or dust.

Sales personnel can always repeat numbers, but in the end Apple is bound by their warranty terms stating that liquid damage isn’t covered by the warranty. This is no different than Samsung, Google, LG, or anyone else selling a consumer grade mobile phone.

Water and other liquid damage to iPhone or iPod isn't covered by warranty - Apple Support

No iPhone is waterproof and water damage is not covered by the standard warranty.

It’s no more misleading than an SUV commercial

showing a vehicle bouncing over rocks or driving through water. They don’t tell you that filming required a dozen vehicles and just as many tow trucks. The warning on the screen will be that it’s a professional driver on a closed course and “DO NOT ATTEMPT”.