Yes they are soil mites and are a part of the soil food web.
they feed on fungi and decaying organic matter such as dead roots etc.
Are you growing organically?
because you’ll want soil life
Are you using nutrient salts?
Then you could get rid of them by using H2o2 drenches.
But this will also kill off your microbe populations in the soil such as Trichoderma, mychorhaezae etc