1. "Couple of thousand units." You have no idea how many were in the first run.
2. You have no idea how many were produced since July.
3. People have been taking deliveries this week.
4. Pandemic vs supply chain.
To pile on...
1) We know that some countries were severely short shrifted on body deliveries in the first run. It appears that - as anemic as it was - the US got a disproportionate share. We saw multiple stories from Germany of major city retailers getting one or none. This means that there was likely a great, yawning chasm of demand outside the US for the next batches.
2) Japanese manufacturers lose a great portion of their margin if they air ship product. Instead, they like to pulse batches via boat when practical. It appears a decision was made that people were going to get their cameras one way or another, and if it took an extra 6-8 weeks, that was fine with them.
3) The R5 does pretty much exactly what it says it'll do in its manual, that was written before Youtuber video guys got their mitts on it and collectively clutched their pearls, swooning from heat limits. The notion that Canon has the humility to believe its specs were so wrong that it needed to redesign anything a few weeks into a release is a different reality than the one I've been living in since I started shooting the brand about 20 years ago.
4) Evidence of such an alternate reality would be easily proven with the new batch cameras showing different capabilities or behavior. (And they don't.) There are
5 known issues wrong with the R5, and these haven't been addressed.
... and to bring this all home to Bryan's original post...
5) The idea that Canon is going to announce - never mind deliver - all these lenses in a year would be to say that Canon is going to triple its cadence of lens deliveries at a time when it has major supply bottlenecks. If Canon were a company that ever (ever) published a lens roadmap, you might think that this was merely an outline of what was to come for the next few years, but - frustratingly - Canon isn't a company that publishes roadmaps.
6) I was supremely wrong on the rumor about the R5, disbelieving that Canon was a company either capable or willing to put that much power in a mirrorless body at this point in time. I sincerely hope I'm as wrong this time with my skepticism as I was then.