Until you lose access to your password manager, of course… which is bound to eventually happen, due to hardware or software issues or loss of the device if it’s local, or due to network issues, the provider discontinuing the service, or inevitable enshittification if it’s online.
It has never happened to me and is absolutely not bound to happen, especially if it's local and backed up...
I'd rather remember one REALLY secure password than 100+ bad ones.
Nobody said it makes it okay to do that, but that does thoroughly discredit this particular source, quite obviously