NVIDIA has launched cards without significant stock. I don't think they give a ****. If one card was out there they'd call it something other than a paper launch. It's really about stealing AMD's Thunder. NVIDIA has always operated like that.
As for the supply commentary, I agree with you. The demand far exceeds supply. Therefore, it's a supply issue. Having said that, there is a difference between long term supply projections and short term ones. It doesn't always make sense to build up production capacity when it's only going to be inadequate in the short term. Of course, NVIDIA doesn't produce anything directly as it is a fabless company. They may not have any control over their partners and increasing capacity on the 8nm node may not be something Samsung is willing to do. The supply issues may not just be there either, we really don't know. I took Jensen Huang's statement "it's not a supply issue" more to mean that there isn't a **** thing that NVIDIA can do about the problem.
That may mean that they believe the supply issue is a short term one, not a long term one. Even saying that card availability will be **** through early 2021 doesn't change that. Initial demand is high. It may drop off some when AMD's RX6000 series launches. That's almost a given. More than that, the 5 month window of poor availability isn't likely to be uniformly poor. That is, we are in the worst of it now and it should be better by mid Q1 2021. Past that, the demand should taper off going towards the middle to end of 2021 where availability might be projected to be adequate for the demand.