it was obsolete as a shelter by 1960, it's just buried under a bunch of dirt.
Later shelters like for NORAD in North Bay were deeper, and in hard rock. But they aren't expected to survive a large h-bomb either, and those shelter locations are well known.
Canada's not as enthusiastic about that military spending because little of that money goes to Canadian companies. Even for things like shipbuilding, the rules are unfavorable to Canadian industry and a lot of the industrial benefits go to US companies. Canada tried to negotiate industrial benefits on the F-35 program, but it didn't go well, and Canada entirely withdrew for many years.
A GOP Senator is just a mouthpiece for US industry, they just want more Canadian spend, they don't GAF about actual defense of Canada.