Its not spider mites. Its Ph Lockout followed by upping nutes. Most likely caused by bits of PH down that didnt dissolve.
I talked to the guy whose picture that was and he says none of the other plants in the room have the problem.
Would you cut this plant early if there was still 2 weeks to go?
No spidermites leave little dots eveywhere. If there's a bad infestation there can be so many spots that it turns the whole leaf yellow dot by dot. I you think you have mites just look underneath the leaves and you'll see them, they're very small black or white dots. The white things that look like dust are eggs.
Ive looked really close at the Pictures I found and didnt see any little red bugs. And this guys pictures of his other plants dont seem to have the same issues in the same room