Considering VIA owns the corridor Windsor to Chatham, Metrolinx owns Kitchener to near Georgetown and Bramalea to Union, and the conflicts with freight are mainly limited to Komoka through to the Western Fairgrounds, Stratford to Kitchener, and Georgetown to Bramalea, I'm not sure that the HFR scheme is as relevant in Southwestern Ontario. Really the worst section for speed was Kitchener to Georgetown and Metrolinx is improving that section.
For Hamilton/Niagara Metrolinx owns Union to near Aldershot, and the only contention is Aldershot onwards, and Metrolinx is putting in investments there... so again does it make sense for VIA to put HFR money there when the goal is to have corridors where passengers come first?
If there was to be HFR money spent in Southwestern Ontario the best investment is to help Metrolinx pay for a freight by-pass Bramalea through the 407 corridor to south of Milton, and to have VIA buy the corridor Kitchener to London, and maybe a basket-weave at Komoka depending on the challenges scheduling trains from there onto the north track at the London station. For Hamilton/Niagara the best investment is to buy the south half of the corridor from Aldershot to Bayview junction, the creation of a basket-weave to keep GO to the south side of the corridor as it turns back east towards Hamilton, and to buy the south half of the corridor Bayview Junction to Stoney Creek, and the whole corridor to Niagara Falls. That basically creates corridors where passengers can run unimpeded by freight for most of the trip achieving the goals of HFR.