The way it kills and the duration it takes to kill them is very important on actually getting rid of spider mites.
It happens just how I explained it, the DE drys out the outer waxy layer. Not once does it say is cut it away, or stabbed them to death. The DE takes 6-8 days to actually be effective on mites. And it only will effect adults and nymphs.
You actually have to understand how your pesticides work for them to work properly for you...
Ugh... We grow weed in optimal conditions, yes? In those conditions, it takes roughly 3-5 days for eggs to hatch.
So, 5 days is my benchmark. I've used DE since the early 90s, never had to go past a week of treatment.
The articles you posted say it removes the outer layer, then they dehydrate. The article I posted says it cuts them and dehydrates them. Much like slitting a small hole in a pool.
Say what you will, but it's the same thing to me. Whether drawing moisture out on contact or puncturing the outer layer and drawing moisture out... Dehydration is dehydration. Contact kills.
I understand how it works and it's safe to eat. Beats the hell out of chemicals in my opinion.
That's the best I can do and I'm growing bored discussing something that there are thousands of articles on that all say the same thing.