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.