man page says this:
"To select the nda(4) driver, set the following tunable value in loader.conf(5):
but actually its "hw.nvme.use_nvd=0"
Are you sure you're not using an old version of the manual page?
The one found in 12.2-RELEASE doesn't show what you're reporting, as can be seen on https://man.freebsd.org/nda(4) nor is it present in the source code at the HEAD of the tree: https://cgit.freebsd.org/src/tree/share/man/man4/nda.4
If you can demonstrate a reproducer, feel free to reopen this.
Its not the nda page, its the nvme page e.g. here:
Sorry for the confusion - the 'autocorrect' in Safari keeps changing it to 'name' - hence the wrong subject.
I'll be taking this then. :)