However I have to agree with the person you are replying to. There has been the sort of myth going around that making rockets is hard. It used to be hard... 50 years ago. That is literally the technology Musk has been using for the last 20 years: 50 year old technology (and yes that includes reusability). He has just been doing it cheaper, which there was no incentive for anyone to do before because it wasn't a free market.
The reusable stuff is still misunderstood by most people too. Musk is losing money because of the reusability of his rockets. If he had never pursued reusability he would have made far, far more money from his launch business. Only now, after 10 years, are his reusable rockets just starting to break even with the cost of an expendable rocket (after reuse not before). He is pursuing reusability because it is his passion project, not because there is any money to be made from it.
Since Musk, another 4 private companies have reached orbit, or will reach orbit this year (Firefly, Rocket Lab, Relativity Space, and Virgin Orbit). All of them took almost exactly 6 years from founding to orbit, just like Musk did.
Furthermore, if you have been following closely, you would have seen the huge and humiliating mess ups he had with Tesla where he literally flushed billions and billions of dollars down the toilet. Any COO from another company would have had no problems setting up these manufacturing facilities without trouble, but Musk though he was smarter than everyone else and proved it was the other way around when it came to a competitive business like auto manufacturing.
The man has vision, but this whole AI thing is just Musk getting lost in his own marketing.