Thanks, now I understand where this is coming from.

And the linked article makes clear it's not a worry at all. Key part:

> All in all, there is absolutely zero reason to worry about SSD data retention in typical client environment. Remember that the figures presented here are for a drive that has already passed its endurance rating, so for new drives the data retention is considerably higher, typically over ten years for MLC NAND based SSDs...

Average users virtually never pass the endurance rating, so @teddyh's claim seems awfully sensationalistic.