Earlier quoted context omitted.
Go look at that same graph from 2007 to 2021. If you bought in at the top of the 2008 bubble, you'd have tripled your money by now. Unless you're planning on retiring in the next 10 years, buy stocks.
The S&P is unusually pricey at the moment though.
The thing is, you could say the same thing at nearly any point between 1999 and 2021, and be right, and it would still have been a good idea to invest into the S&P.