Please don’t spread rumours like denying enter and all stuff. They never said that. It all depends on DLI. If they allow you then you can quarantine at any other place provided you have quarantine plan with you. You may go through this link.You could be denied entry if you don't plan on complying with the school's quarantine plan. you could also be fined. Schools could even penalize you if you are not following the quarantine plan. In order to come to Canada you had to agree to follow the school's quarantine plan. If people can't they should consider delaying their travels.
https://www.canada.ca/en/public-health/services/diseases/2019-novel-coronavirus-infection/latest-travel-health-advice.html#a1.5
Govt. officials said that
“If no other options are available, travellers may be referred to a designated quarantine facility as a last resort.” They never said that they would deny entry.