No, he did not.

But he was part of it.

The opposition, meaning the Conservatives led by Poilievre had run their own campaign to defeat Trudeau who was hated by most Canadians. When suddenly he quit, and his party brought an "outsider" a banker from the Bank of England, someone with an apparent good resume, the Liberals were back in the battle.

All the attacks against Trudeau where suddenly neutralized, since the "new candidate" was going to be more like the Conservatives: remove the carbon tax, and be less anti-business. The reality was that Mr. Mark Carney the new candidate who has lived outside of Canada for many years had been involved in Canadian politics on the background all this time, and was an advisor to Trudeau.

Trump's 51st state was the added unpredictable factor, suddenly patriotism in Canada meant support your government, the same failed government that has decimated Canada's economy for almost a decade. Poilievre's platform suddenly became quite similar to Carney's Liberal platform, and then the dice were set.

Poilievre was afraid to go truly Conservative, he was the light version, or the slightly more conservative version of the incumbents, and then many Canadians made the wrong decision and re-elected the Liberals.