"Short dip in the deep end of a pool"
Why is there so much confusion around IP6x ratings? It is pretty simple, IP67 is defined as being able to survive immersion in a half meter of water for up to 30 minutes. IP68 is defined as being able to survive immersion in a meter of water for up to 30 minutes. No, I don't know why such a small difference needed a different rating (I guess maybe the difference between a drop in the sink versus a drop in the bathtub?)
There are no phones rated to survive a drop in the pool - even in the shallow end. Not just because they are over a meter deep, but because the IP ratings are for fresh water only. Now obviously just because the rating doesn't tell us it can survive a drop in a pool doesn't mean it won't - pretty sure all phones rated IP6x would if you fished it out right away. Apple even said they'd tested with chlorinated water, salt water etc. which is isn't part of the IP6x regimen.
I just find it amusing that people think the difference between IP67 and IP68 matters. It does not.