I don't like the wording of the patch note, because the selection criteria also has a proximity component, and the patch note as written ignores that. That said, tank selection is not supposed to be impossible. A MT who loses taunt, an OT who positions incorrectly, or a lone survivor tank could get targeted, and that's intended.
In any case, I would suggest that you test it before panicking over the semantics of the patch note. I PUGed a vSE out of Craglorn today, and the behavior seemed consistent with how it behaved in Update 38. Of course, that's just one run, but it does seem encouraging.