The meaning reads 'Change subject to talk about something different', which is not justified. In fact, it can only be justified when the subject of the preposition is a phrase that states the new subject of discussion. But that's not a particularly common use of veer, and even with that use, to seems to be just as common.
Also, the notes claim it's inseparable. It isn't.
(I wouldn't count it as a phrasal verb at all, actually. It's really just a verb followed by one possible preposition.)