I don't know if this is what they were referring to but the usual beef is that Host Defense's products are mostly mycelium w/ ground inoculated rice medium in the mix and not fruiting body or even 'pure' mycelium.Really it's not?
Stamets is pretty aggressive in defense and generally says that certain beneficial compounds may only be in the mycelium (I think the truth is case-by case depending on the type, so he's not necessarily wrong) and that the mycelium's interaction with the rice also potentially produces other beneficial bioactives, so why not include it.
I don't know where I stand. Given the dosages on some of the Host Defense capsules you're basically micro-micro dosing some of this stuff, what are two little capsules of a maitake mycelium and rice blend going to do when you could also buy a big old maitake fruiting body at the store and fry it up?
My sense of Stamets is that he's a good guy but that really Host Defense is in the business of selling high-ish-priced low/'micro' doses of likely legitimately beneficial mushroom mycelium primarily to fund his true passion projects like research and advocacy; that he's not 'trying' to hoodwink anybody but that it's definitely a money-making venture. As are all the mushroom supplements businesses
I think some of the powdered, non-capsuled versions they released as a market response to other products are a better value, and I alternate those with other brands.