The problem is anybody's opinion is pure, 100% guesswork until the tyre is removed and wheel, tyre and bead are examined. Since the actual sidewall has damage (as opposed to just the protector being peeled off) I'll wager it's an MOT fail by most testers, simply because of the liability risk if they give a chancy pass. Sidewall or bead failure are a real killer as deflation is instant and the tyre can strip off.
TBH if you needed to ask you were probably uncomfortable with it so I'd change it for sure :|