For what its worth, I've known about endmyopia for some time as well. Snellen chart is how you can verify things for yourself, you can only lie to yourself so much. I've improved my eyesight as well but nowhere near as much as Aulig has (roughly an improvement of 1.5 diopters over 3 years). I'm also much older, mid 30's, so that might be a factor in rate of improvement. I can't even see out of the glasses that I had before I started, so I know its definitely improved.
Congrats on the improvement! Progress will most likely slow down for me too, from what I heard it's common to have quick gains in the beginning. After that it's supposed to be .75 diopters per year, so roughly what you're getting :)