Only up to a point. It really does depend what's on the tape - if it's obviously just a heated row, then they might be able to shrug it off. If it's a record of a serious act of domestic violence - and it really sounds right now like it could be either - then I think it could seriously damage him.In the new politics stuff like this latest ‘scandal’ just adds to the outside narrative that BJ, Trump require and create.
I think it damages him anyway tbf. Maybe not fatally, but there's a lot of people who yesterday morning may have been reasonably comfortable with the idea of a Johnson government as long as he can win who are suddenly a lot less comfortable.