they don't show their work, so who knows how they decided that the situation would be so much worse without the steps that have been taken, or if the truth isn't even that it already is, due to an apparent lack of actual testing. but, i'd be missing the point if i were to take the calculation seriously - these are just big numbers designed to reassure you that the steps that they've already taken are working so well, and we need to carry on that much longer.
i don't particularly want to impugn these people, because they legitimately realize that they're going to have capacity issues very soon, and they think they need to drastically alter public behaviour very quickly in order to prevent the system from overflow; the question of exactness is perhaps unimportant when faced with the requirement of such drastic social conditioning. but, i'm supposed to soberly analyze the data, here, and i can't do that, if i can't take it seriously.
they may even fully realize that what they're doing is futile, but they don't have a better idea.
so, this is really a desperate plea: they really, really, really want you to stay inside now, please.
i'm not commenting on the actual modelling.
slides here:
https://www.cbc.ca/news/canada/toronto/ontario-covid-projections-1.5519575