"Its a given at this point that Trisquel 8 will NOT have the zfs.ko module
available by default."
You mean "at all." The GPL violation happens just by the distro distributing
the software. Whether it's installed by default is beside the point. So yes,
Trisquel will not be violating the GPL.
"I'd like to see if the FSF statement has changed Canonical's mind in not
having it by default, but maybe as a package in the repos that requires
manual installation."
Same as above: Being installed by default doesn't determine if a GPL
violation is happening or not. Distributing the software does, and if it's in
the Ubuntu repositories they're distributing for people to download
regardless of if it's installed by default or not.