Definitely not true, but it is hilarious. Though it's worth mentioning in this context that Musk's idea for 'the loop', while conceptually close to a simple car tunnel, manages to actually make it worse. It does not solve existing issues of tunnels, while creating a whole host of new ones.
https://twitter.com/realdanlyons/status/1211649509236838405?s=19
Not sure if this one is true, but is still funny. Mostly coz of the tunnels one, which is true. :-)