No evidence to support this. If anything, all evidence point against this hypothesis, unless if you think Tesla lied in the Q1 delivery report about the 2020 in the week ending 4/2, or Elon lied on TV telling Gayle King that they made 2070 cars that week, or he lied in the email leaked to media.
From reports of delivery centers there seem to be constant cycling of cars coming in and going out, and no report of cars piling up. The only place that cars were piling up was at the Fremont lot, which emptied out during the shutdown. So there is sign of bottleneck in shipping logistic, but nothing indicating the service network.
Parking lot in Fremont emptied out during shutdown, supporting hypothesis that Tesla needed to catch up on shipping logistics, and against the hypothesis that these cars are undeliverable.
We have not seen a single VIN or delivery report from Canada, so again nothing to support this hypothesis.
IMO I don't see anything supporting your 4 hypothesis, and you missed the most likely possibility that InsideEV is wrong.