"electric cars for everyone" was the vision of the founders of Tesla, prior to Musk functionally stealing the company from them.
"humans on mars" is just repeating standard sci-fi tropes that have been around for 50+ years, while not actually solving any problem.
"tunnels everywhere" makes sense for public transit, and literally any other case it's just extremely expensive roads - making it a vacuum just makes it expensive and also impractical.
"direct mind machine interface" I dunno, it's just another sci-fi trope since basically the moment electrical computers, it has actual value for many injuries, _maybe_ it has value beyond that, but again he's not coming up with anything novel or new.
Musk isn't some amazing genius, or revelatory thinker. His "let's populate mars" to solve "over population" surely indicates the opposite.