That diagram could have been presented in another way but...

You aren't allowed to go below the green "Life curve" line, excessive (accumulated) writing would be throttled if it was to "break the line".
Secure Erasing/Cleaning looks to work but there is a finite number of "clean-cycles" as well I'd presume.

I agree to some extent that the "roof" for daily writes should be well above the limits that e.g. Intel sets for the daily average.
Unless the SF drives are capable of writing the same amount of data it would mean that there is something fishy going on, compression/write amplification should easily make the drive last "years" longer than other controllers *if* using NAND of the same quality.