I'd argue it's mostly true. I've never used Fahrenheit for a pool, the pools I've used in multiple cities around the west are all in Celsius. I'm as confused about 101f as a hot tub temperature as I am about knowing if 72f is a good room temp. Like most people I know, I switch my AC to Celsius immediately, because otherwise I have to do a mental conversion any time I want to set it. I think the only F a Canadian is almost certain to use is in oven temperatures..

And the "is it for work" adage for lengths only really applies to trades.

When evenings dip below 20C we like to sit in our 101F hot tub.

It depends where you are in Canada. Regions like Windsor Ontario use °F for air temp and AC, whereas Ottawa uses pretty much just °C. Unless your in a hotel for some reason.