Not at all. I'm unaware of any other heavy lift vehicles developed by a non-government entity that fly for $90 million (versus Delta Heavy's $350 million cost) and are completely reusable besides the second stage and the fairings. I'm unaware of any auto company created in the last century in the US, besides Tesla (and the ghost of GM shepherded through bankruptcy by the Obama administration), that is still in business [1].

So to answer your question, these are "solved" in the same way if you proposed to yourself, "Hey, I can build an iPhone because Apple can build and iPhone". Could you? Absolutely. Are you discounting the enormous amount of work and capital necessary to pull it off? Absolutely.

[1] https://en.wikipedia.org/wiki/List_of_defunct_automobile_man... (List of defunct automobile manufacturers of the United States)