Sure, I can understand how one could read "left-leaning parties" and assume that I wasn't writing about NDP and Liberals in general but about Carney's government specifically.
The Liberal party has had two major factions/traditions/streams going back at least five decades. Carney is in the Martin/Turner/Martin stream. That stream will not control the party indefinitely. The other stream is the one that cheerfully announced its intention in 2015 to spend all the hard-earned fiscal improvements of the preceding 30 years of governments, and more. They'll be back.
I predict that the new bottom-line spending number will remain, but gradually money will be shifted out of defence and into other portfolios. Even as that shift happens its engineers will agitate for higher taxes "because of all that defence spending increase".