So, no, financial scrutiny is not why Tesla sells vehicles. It does because of the hype, the status symbol, the better design, and lies of self driving. And these don't really matter for trucks (except stock market rewarding hype, just like Bitcoin mania). So no, Tesla won't dominate the niche of short haul trucks that EV trucks have opened up.
Pretty big “if” they’re chief. While they very well may not have any demand issues, I’m going to go out on a limb and say they’ll probably will have supply issues. Launching the production of a new model is no walk in the park and the organization already seems to have problems with QA on the existing models.
So, I would not dismiss their ability to execute on what they've announced here. They are obviously well aware of supply chain challenges and have been heavily investing in solutions for that. And they obviously waited with this until they had the logistics and manufacturing in place. And it seems that they are re-using a lot of components they already have - like their drive train and batteries. And they do have a lot of new production capacity coming online.