Just to clarify, it's not $379m per year - he was paid out a large amount for meeting a market cap target as a bonus, not as a salary.
I very much do agree with your points regarding him leaving the money in Lucid to grow the company and accelerate the introduction of new models, expand the factory, deevelop the energy storage and technology arms, etc.
On that point, i do agree with Musk - and it is very much a valid point(s).