Over optimistic claims aren't at all exclusive to Tesla though... If anything we should take all claims with 10 grains of salt...
Tesla and Musk, spent the past 10 years saying that many things they work on are <1 year away. For any sane person, that timeframe implies the product is ready, already tested and it's just a matter of figuring out the details.
I've recently spoke with somebody who absolutely believed Tesla is going to automate all their US manufacturing and fire all the workers, thanks to Optimus, beginning next year !