

I ran into similar issues before, but adding a passive cooler brought the temperatures down sufficiently.
However when researching the issue there were several people that claimed that ~70° C is actually the design temperature for these SSDs, which would explain why they usually don’t come with a cooler.

Yes, but afaik the temperature reading is also on the flash itself. On Samsung nvme drives you even get two different temperature readings to differentiate it if I recall correctly.