I think the GP here means test drive the particular vehicle you're buying, not just some other vehicle of the same make & model (and possibly, but possibly not, trim level).

With Tesla, the most you can do is refuse delivery, but you won't get to drive it before you do that...

GP's not wrong, but as someone who only started driving frequently well into my 30s, I've personally never had the "I must kick the tires" mentality -- and Tesla's at-the-time "7-day return policy" helped a lot with concerns about a lemon.