Not the whitepaper research paper I was trying to reference but if you read just below the temp chart image is explains similar info about how quick SSD (unpowered) data loss is based on ambient heat. HDD while also succeptible to data loss is a better archive medium than SSD https://www.anandtech.com/show/9248/the-truth-about-ssd-data-retention
Like I said that is just one link, there was a recent whitepaper about it, just lost my link.