Yes, but the insurers covered by the order are supposed to take the necessary measures if they know, for instance, that a vehicle is being used as part of a blockade or unlawful assembly. If the SAAQ had such information, it should have suspended truckers' insurance policies.
Now, did that happen? I don't know. Obviously, though, had it been necessary to suspend insurance policies, the information would have been communicated and the truckers would have been warned so that they could leave the area.
The RCMP issued quite a few warnings to truckers to let them know that it was time to leave.