Your post implied that the hotel quarantine policy actually
caused more spread of the virus. Nowhere in the article (nor in the report as far as I'm aware) is that claim made. Some cases of spread within the hotels does not prove that either, since the issue is spread to the community
relative to not having the hotel quarantine policy.
The report does criticize the policy on a whole range of points - including some lack of enforcement on arrival (hence the increased fines announced), effectiveness compared to (for example) better enforcement of the at-home isolation requirements, and particularly and especially the major gap, which is that there's no hotel quarantine requirement at the border.
But "science" has not claimed that the policy has resulted in
more spread of the virus. No need to make stuff up.
That panel made a number of recommendations - but the government
could decide to make it more strict by eg imposing more requirements for those arriving at land borders. (Yes, the panel made different recommendations - but the Premier of Ontario is calling for different things.) Some of those recommendations are not exactly science but about trade-offs - typical public policy stuff - effectiveness vs cost. Government would be perfectly within its rights to decide that more strict at higher cost is better policy (not that I'm saying they will).
Anyway for your specific case, I'm not sure that relying on travelling first to USA to then cross into Canada will necessarily be better either individually (eg access to vaccines getting quite good now in Canada, you could be surprised by different requirements, etc). Obviously hotel costs are an extra cost, but so is extra legs of travel (usually, does depend on specifics).
One thing 'science' is quite a bit more clear on is that all things being equal, more travel is more risk of spread - and right now, comparative USA/Canada new cases are about the same per capita, and deaths per capita still higher in USA. (Although numbers fluctuate and it does depend a lot on which province and state, etc - at any rate, no easy answers there).
But hotel quarantine
causing more spread? No, 'science' did not say that.