Is very common, yes. Sterilization and clean working space are required. The main problem here would be the economics of the system, but the man in the video k

Is very common, yes. Sterilization and clean working space are required. The main problem here would be the economics of the system, but the man in the video knows what is doing. He has probably been trained in lab techniques. Can be seen in clever details like taking the second sample far away from the first triangle sampled (to avoid contamination never returning to a part visited yet). Another smart trick is to avoid picking the spores from the lamella. Some fungus are parasitic of edible fungus and live over its host lamella.