Yep. He said he couldn't commit it to it - which is far from "unequivocal". And that the land would be sold off - which hasn't actually happened of course.
Nothing stopping Labour from resurrecting it/rebranding it.
A rebrand is definitely needed even for the parts under construction as HS2 is a worthless brand now. Crossrail changed to the Elizabeth Line when construction moved to operational phase so something similar should be considered for when the London to Birmingham HS line, something Shakespearean maybe, goes into service and then another name for Birmingham to Manchester.