It’s plausible that Trudeau could want to push through voting reform as one last move to salvage something since him losing the next election likely spells the end of his political career.
The problem is the Liberals as a whole. It pretty predictable Conservatives are going to do a horrible job and by the 2029ish election the tables will be flipped and Liberal will only need to campaign on not being a disaster of a party like the incumbents.
I don’t think the Liberal are willing to sacrifice their entire future as the one of the two alternating parties in order to gain a few more seats.
338 on a federal level projects them for 67 seats and 24% ± 3% on the popular vote. That translates to 85-91 seats which is a decent gain.
However this would mean the Liberal will likely never get anything close to majority again. I would also believe they would slowly dwindle in popularity with a rise of smaller parties. That’s a lot give up for 24 more seats for 4 years.