nothing new here, you can find those kind of video from all oneplus devices and almost all popular phones.
My galaxy S3 was in a hot jacuzzi all night ( about 8 hours ), and after 3 years, it still working,
I drop many electronic devices in water, and it still working, even without the ingress protection.
Make sure to not power up the device before it's completely dry (about 2 weeks)
Op5 boards are probably IP ready, but the case is not sealed. You won't have any issue, until the oxydation is becoming bad.