You can rinse your live sand, as rinsing isn't antibacterial in nature on abrasive surfaces like calcium carbonate structures of the reef will be. incidental floc is removed, critical bacteria stick.
We rinse it to get the initial clouding out, bacteria are not factored
Adding live rock either imports more bacteria or the new surfaces are inert and present new vital space for existing bacteria to multiply
Aquarists ascribe all manner of bacterial control to themselves they don't have unless we are talking meds, extreme temps, and drying of surfaces.
Classic response to pre rinsing live sand:
It's live, if you rinse it then it will not be. Ask someone who runs a bacteria lab in food science as a living if they agree to that.
I've bought fiji pink live sand about twenty different times and guess how many pods, worms, and shrimps and moving rinsable animals I got in the bags. Literally not any in 16 years
We wish bacteria on actual surfaces like hospitals and food prep areas were as weak as they are stated to be in aquarium forums. We would simply squirt the surfaces with saltwater and be sterile/autoclave schmatoclave.
The main liability here is capping filthy bottom sand with a fresh new layer of clean. The bottom sand if tested from a bottom muddy layer might read much higher in nitrate and phosphate than the top water. If not, cap away.