He can afford the fine. Although what happens if he has to get tested again. I.E repeat travel. Another fine. He is fined for not taking the tests, often an automatic duty is fined. Regardless of rights. It can go to court for not paying the fine where jail sentences can be applied. Yes he can reject the tests, although unlikely any fine.

He is travelling and they can prevent travel or fine for using it if not meeting the criteria.

That is Canada where he can get away with it as citizen. Although outside of Canada refusing tests can lead to a jail sentence Canadian or not.