Cynical answer: he convinced VCs that his particular brand of shared office space was better than everyone else's, actual revenue be damned, and they believed him . That's it. Straight from the article: "Neumann declared that WeWork’s “valuation and size today are much more based on our energy and spirituality than it is on a multiple of revenue.”"
In my lifetime we will learn if 'tech' companies are overvalued. The fact that my friend, a total casual, is investing in Tesla and Apple via Robin Hood has me concerned the market is inflated with dumb money.
Now Beyond Meat, well, that's a different story haha.