Maybe he didn't word the statement as well as he could have, but (many/most/all?) unipivot arms certainly do have the limitation of azimuth and VTA affecting each other. Is SME V unipivot? Either way, nothing in audio was ever more frustrating for me than using a unipivot arm which simply was never "set and forget". On the fly VTA was pointless as I'd need to get out the Fozgometer to bring azimuth back in line each time.
Bazelio, I agree with you about unipivot arms in general. I find them very finicky. Some do, however, have magnetic stabilizers which are supposed to stabilize the arm and lessen changing azimuth as the record plays. I never really thought about it, but it does seem as though azimuth does change along with changing arm heights if the headshell is offset.
The SME V is a gimbal arm, not a unipivot. Fremer's comment was overly general, IMO.