I like how people talk about years and not miles. 5 years old model 3 with 14k miles vs 2 year old model 3 with 85k miles - do you compare them? I read that article and thought it was of no value.
Good point. Time does have some influence and miles should average out if they have enough stats. So it's not useless.
I'm not sure you can assess how well the Model 3 will do in 3 years from so little data. But the little data that is there doesn't look like it will be less 10% in 6 years to me. String downward trend in year 2 for 2018 Model Year. Another year might have better stats. The changes in software over the past year might skew things too (bias it to look better than it is). All RWD Long Range Model 3 should have been at 325 miles from the start.
The Developer of the Stats app has another App out that I think does do degradation based on miles.
Model S/X look pretty good except a couple select years.
Chevy Volt looks great, but might be partly be how they "hide" some headroom.
I think initially Tesla might have hide some headroom on the Model 3 and the degradation threads went through the roof when they exposed it.
EDIT: I read some of the article and I thought it was pretty good. They actually comment on the fact miles had little to do with degradation. They also commented on the Volt and why it looks better than it really is.