Yeah, this sort of thing is (I think) important for helping to solve a coordination problem. Especially in Centre, with no incumbent, people are trying to feel out whether it would be more strategic to vote Liberal or NDP, and Trisha has had better ground game than her Liberal opponent.
There is obviously a strong presumption that the Liberals will do well and the NDP poorly across Canada, but I don't think that presumption is justified in Edmonton's three central ridings, mostly just because of well-liked (in 2/3 cases incumbent) candidates with good ground game. The framing that voting for the NDP in those ridings is splitting the vote 'away from' the Liberals presumes that the Liberals are guaranteed to perform better, which I don't think is true in those three ridings—even if it probably is in most of the rest of the city. Like, it's fine to vote Liberal in Griesbach if you like the candidate or the party, but I think it would be extraordinarily stupid to do so as a form of strategic voting.