I’ve never been happier to catch a hardware error… 
T10 works. The SSD (Intel Optane P4800X) itself takes the checksum generated by the OS and verifies the data.
I only noticed because the virtual machines were behaving strangely. Particular applications would become sluggish or outright freeze, persisting between reboots of the virtual machine and the entire system.
The data in /home directory was fine and all the virtual machine images were fine too. But yeah… time to swap in a fresh drive and put that one in the triage bin. And I think it’s about time to put T10 to good use in my daily driver systems.