I hear this bit with "traditional car assembly" often. But is it really true? The powertrain isnt really the only difference - EVs are built fundamentally differently (and especially the Tesla models) from the ground up as compared to ICE based cars. If you look at the base series of most large car companies (on which most variants are eventually based) - they've been around for decades in some cases - making it easier to tweak and adjust over time, so production in and off itself hasnt changed that drastically.
I don't know. We all know that, as anything, a modern car is very complex by itself and even the simplest modern production line requires far too much expertise to understand if you are not working directly in the field. So, you have to trust reports, which with an overhyped company like Tesla are more likely than not be laughingly biased in one direction or another.
It is a bit annoying that Tesla has such a track record of failing to reach their own objectives. It is bad IMO, because Tesla is not really under any kind of market pressure (no competition, and client queueing for years), their objective are only investors milestones. As an investor, I would really start thinking Musk is either delusional, hired the wrong people or is humouring me because in reality I'm the one lucky enough to be allowed to invest in Tesla and I should be grateful rather than wasting his time with silly metrics.
It only really matters if you are an investor though.
Consumer win both ways: either Tesla is giving the rest of the market a chance, or they are ready to revolutionised car production the same way the Japanese did in the 90's.