They can, but it's self-limiting in that all you're really doing is supplying an evolutionary pressure that results in UV-tolerant fungi/pathogens.

I once toured a (large) malting works where the soak-tanks are bathed in UV all the time (except when humans need to enter the room) and harsh chemicals are employed constantly to limit fungal and bacterial growth. They are still unable to eradicate those pathogens and suffer constantly from infection problems.

I would think proper humidity control would be most beneficial. Also this set up looks completely modular and you saw the robot arm adding a rack. Each section could be sterilized and put back into production reducing likelihood of mold and if you found mold could remove the effected sections only. With good climate controls and procedures I believe mold could be mitigated.