Different mushroom species have different quantities of active ingredients. Describing the dry weight of a mushroom is really only a secondary measurement of the active ingredients.
Elsewhere on the website they compare 2.4g of mushrooms to about 100ug of LSD. So 1.7g of mushrooms would be equivalent of about 45ug of LSD, and the micro dose range of LSD is 5-25ug. Tripsafe is attempting to describe a light dose, which should include only minor visuals. They are likely using P. Cubensis to describe dosage, which is very common in North America, but only half the potency of the most potent psychedelic mushrooms. “Liberty cabs” or P. Semilanceata are more common in Europe, and are often more potent than P. Cubensis.
There might also be a cultural difference on the expectations for a psychedelic experiences and the activities one should do during it.