It's never possible to guarantee that the market won't go down. So there is a cottage industry of naysayers always predicting the next big crash. They are like the proverbial stopped clock that is right twice a day.
Investing in the stock market is not for the risk-averse. As bad as 2022 was, it was no worse than a once-per-decade swoon. And 2023 or 2024 could be even worse. The naysayers are afraid to take on the risk, so they just wring their hands as an excuse to stay out, then hope to get validated by anyone who will listen to them.
I always ask these guys, if you're so confident that the market will tank, why aren't you cleaning up by shorting it? And they never answer.