Regardless, the literal stated goal of the organizers of this convoy was that the convoy would not leave until the government resign en masse and that the governor general basically decree this protest group the government. That is a textbook insurrection. This memorandum was replaced on February 8th because it was so fantastically treasonous that as it gained wider attention it became unpalatable.
So yes, when people say insurrection, they are absolutely correct. It isn't the "far left" pointing out that fact.
Just as it isn't the "far left" who point out that two of the primary organizers are a long time white supremacist, and the other is a literal separatist who has long petitioned that Western Canada should join the US.