Per the article it was only a 4-5 week project, which would confirm my suspicion that they only replaced the pilings.
I have a bridge replacement project out to bid today to replace a wood timber bridge built in 1938. I don’t know what standards they are using in the Great White North but they don’t appear to be the same as we use in the States. If it was a complete replacement, then the concrete would still have that newish, gray/white color to it, Railings would be higher as well as new guardrail on the abutments
Youre right the only things that look new is the pilings.
Maybe they pulled up a bunch of timber columns up along with that pesky concrete stuff on the bottom that just wouldn’t fall off.