I believe the photo I captured from his posts is unmistakably a White Mite. He said that there are many of them which also seems logical that they are White Mites. Surely even a single Thrip would have left visible signs of damage as voracious as they are. Whatever the case may be, Spinosad will kill them.
At the end of the day, he has an infestation that he needs to attend to immediately.. And learning from seasoned growers is the best way one can learn to deal with it... And AFN is definitely the right place to be for that....