I don't take this to be totally true, if the crypto in question is Bitcoin, then it could be correct as Bitcoin is a long term project, that's sustainable and has an actual use case, thus, it could undergo correction periods and plunges, but it would eventually rise back up again, that's cause the demand will continue to rise, with the influx of institutional investors, prominent individuals and the rest, Bitcoin is surely going to be around for the long term.

But having said that, I can't think the same of "every crypto", there are many pump and dump coins, lottery coins, useless/scam coins, etc, many of them are going to pump and then dump and never rise again, some others will just be pumped to scam people, and afterwards they'll dump forever, that's the situation with crypto, I believe only Bitcoin is the coin you can trust not to just dump outrightly.