Canada

The part that struck me as nonsensical was "the more there's demand the most there's supply(and cheaper prices)." It remains unclear what you meant to say, but perhaps you were thinking of some kind of economy of scale effect, where a larger market leads to more efficient production? That seems largely inapplicable here, though.

Anyway, that there's "too much regulations" is one overly simplistic answer given by certain politicians around here, just as "too much immigration" is the overly simplistic cause often given for our housing market problems. There's at least a little bit of truth in each if you look hard enough, but really it's a pretty complicated situation with no easy answers that requires more sophisticated analysis than seems possible to bring anywhere near visibility in contemporary sound-bite- and clickbait-based politics.

Despite that, given all the various longstanding and intractable ways in which our systems of housing, housing investment, and urban development are currently fucked up, rapid population growth certainly does make that problem worse too. It may not be the root cause of the problem, but it's another push in the wrong direction for a situation that's been bad for as long as most of us can remember.