I just learned today that the operation I used to procure the hardware and software to delete my e70 years ago has shut down. Or at minimum gone into hiding within the confines of his old shop and shut down the website.

Good luck on finding a source these days. The EPA has been cracking down harder and harder on deletes over the years. As mentioned it's prevalent on the 3/4 and 1-ton diesel trucks (Duramax, Cummins, Power Strokes, etc), primarily in states that don't do emissions testing.