Although the formal rule changes did not instate officially a Prime Minister's Question Period, the Liberal government proceeded by convention or practice to keep this in place.
June 20, 2017 - "During the debate Liberal MPs, in defending the changes, doubled down on the pledge that prime minister’s Question Period will continue by convention despite being taken off the table of formal rule changes, and that the changes to do more to help opposition MPs than they do the government of the day." - Liberals’ House rule changes pass, will be in place for fall sitting - Rachel Aiello, The Hill TImes
June 15, 2017 - "On the Prime Minister's question period, our Prime Minister is firmly committed to being more accessible to all members of Parliament in question period. Our proposal to introduce a PMQP would significantly enhance the parliamentary accountability of the Prime Minister. Here's what it would mean: when the Prime Minister attends question period on Wednesday, he would answer all the questions that day. This special question period would be in addition to the other days of the week when he attends the regular question period to answer questions with his cabinet ministers." - STANDING COMMITTEE ON PROCEDURE AND HOUSE AFFAIRS - Bardish Chagger (Leader of the Government in the House of Commons)
April 2017 - "Since April 2017, there is a new Prime Minister’s Question Period (PMQP) on Wednesdays in which the Prime Minister has committed to respond to questions" - Mandate Letter Tracker - Government of Canada
March 10, 2017 - "The Liberal government is asking MPs to consider a number of changes to the way Parliament functions, including the introduction of a question period dedicated to the prime minister, the elimination of Friday sittings, limiting the ability of MPs to filibuster committee meetings and allowing MPs to vote electronically." - Liberals propose changes to how House of Commons works - CBC
January 28, 2016 - "Dominic LeBlanc will appear before the Commons procedure and House affairs committee this morning to promote the Liberal vision of how Parliament could work better. [...] The Liberal campaign platform proposed a distinct prime minister's question period, perhaps similar to what the British parliament does once a week." - Dominic LeBlanc asks committee to consider Liberal reforms - CBC
January 28, 2016 - “For question period reform, we could possibly have some form of a prime minister's question period. You know that was a commitment we made. Just to be clear, that was never made to substitute for the Prime Minister's ordinary weekly appearance in question period.” - Standing Committee on Procedure and House Affairs