I'm just saying what it says on the note there itself, not being a negative, but just stating that outright saying SSD isn't good for archiving isn't entirely true since there is a criteria that retention is measured under. Nobody will ever be storing data on an SSD at maximum TBW, and as mentioned already, we have been storing data on flash storage for many many years without data issues.
HDDs can also lose data over time, all it takes is a knock or a magnetic field to corrupt some data..
The idea behind backups is to have disaster recovery in mind, so the backups themselves are backed up somewhere too.
Also, Having deployed SSD machines for years, some of which remain unused for 6-12 months at a time and boot up perfectly with no loss of data.