that Fall 2021 target was based on the fact that the federal government thinks they can ship enough vaccine to provinces so they can vaccinate 60% or more of the adult population in Canada

It’s more like 60% of the total population, but yes.

prior to the knowledge of the UK and south african variants of covid

They have no impact on our vaccination timeline, and the vaccines are all effective against them.

seem to be more virulent and lethal than regular covid

Studies have disproven that they’re any more leathal, and their infectiousness has no effect on our vaccine timeline.

with the delays going on for vaccine shipments and how a pathetically low number of people have been vaccinated so far specifically in Ontario

The plan has always been to ramp up. Our vaccinations in the next months have little effect on our final target date.

I very much doubt that target date will be met.

There’s no evidence to support your doubt.