iPhone XS Waterproofing

I forgot I placed my iPhone XS on the hot tub cover.
When I flipped the lid closed, into the hot tub my phone went.

The new iPhone XS is suppose to be waterproof; or at least water-resistant for up to 30 minutes when submerged in two meters of water. I have always been very careful with my iPhone. After more than a decade of iPhones, I've never dropped one in water or cracked a screen, etc. 

Last night, I decided to use my iPhone while soaking in the hot tub. I've only done this a couple times since getting the iPhone XS, last month. (I don't even have a case for it.) And, wouldn't you know it, I dropped it into the hot tub for about 30 seconds (That's how long it took me to find it.) I pulled it out of the water and, lo and behold, it hasn't skipped a beat. It's working perfectly.

I would have never brought it into the hot tub, had it not been water resistant, but, now it's nice to know that it works as advertised.