We're talking about different things. The French withdrawal from NATO unified command is a good example of what it means to say relationships can't just be repaired; it took 43 years to bring them back!
It's true that the news can overstate just how much things have changed. The US and Canada remain major trade partners and strong allies, with NORAD currently in the middle of a week-long joint exercise, and it's unlikely that's going to change. But you should not expect a return to friendly trade relations in 2029.
But they can be repaired. The OP claimed:
> Other administrations will not be able to repair the damage
So if you disagree with them you should reply to them and let them know the damage can be repaired.