> Even the cheapest SSDs, say those with QLC NAND, can safely store data for about a year of being completely unpowered. More expensive TLC NAND can retain data for up to 3 years, while MLC and SLC NAND are good for 5 years and 10 years of unpowered storage, respectively.

This is somewhat confused writing. Consumer SSDs usually do not have a data retention spec, even in this very detailed Micron datasheet you won't find it: https://advdownload.advantech.com/productfile/PIS/96FD25-S2T... Meanwhile the data retention spec for enterprise SSDs is at the end of their rated life, which is usually a DPWD/TBW intensity you won't reach in actual use anyway - that's where numbers like "3 months @ 50 °C" or whatever come from.

In practice, SSDs don't tend to loose data over realistic time frames. Don't hope for a "guaranteed by design" spec on that though, some pieces of silicon are more equal than others.