It's a big premium still, especially as it's based on forward earnings, which is essentially analysts guessed (you can ascribe any value you wish to those).
Ben Graham famously said the stock market was a voting machine in the short term, and a weighing machine in the long term. You are starting to see that now, as people on the Musk Ponzi scheme have to deal with the fundamentals of how much profit they get per pound spent.
The slight aside from this, is that companies like Tesla fuelled growth through low interest rates (now gone) and share dilution at ridiculously cheap prices. Essentially Musks wealth was accumulated on the backs of creditors and shareholder who funded the tab. It will be interesting how Tesla gets on now those huge share premiums are gone, and probably wont come back.
To answer your original point though, 30 forward earnings is huge. I think under 20 actual earnings would be an interesting point to have more of a look at Tesla, who do have some scale advantages in Everton space.