It does have a permanent mount point, this is the line in /etc/fstab: UUID=00d6c142-ca89-4f65-93d0-dd74f14236f8 /mounts/00d6c142-ca89-4f65-93d0-dd74f14236f8 ext4 defaults,noatime 0 1
I looked and couldn't find any settings for disks being hotswappable, and it hasn't happened on any other distros i've tried on this system, so I don't think this is it.
Looks like it was 1983 https://en.wikipedia.org/wiki/Mister_Rogers%27_Neighborhood_season_13#Episode_9_(Games)
iPhone 5(2)