GM was a great investment. I don't see many people who bought it in 1926 complaining. Tesla compounds on their success by improving their products - i.e. how capitalism works.
This is the funny thing about buy-and-hold forever. Eventually, all of today's companies will go to zero, if you look forward far enough. But the economic value they produce today allows the lot of us to do things today (eat food, build other businesses, whatever) and the future companies benefit on that. Owning a blend of companies should get you a continuous mix and, barring a mass extinction of companies, you'll be fine. (And in the event of that, we'd all be in the same boat anyway.)
I guess that was the point, but the information is not actionable and the wording is terrible.