Much like making bubble hash does not require a freeze drier, collecting trichomes does not require making “bubble hash”
On the other hand, making CBD isolate generally requires at least two solvents. A primary extraction solvent, and a crystallization solvent.
Folks using CO2 as a primary extraction solvent have been known to claim solventless. Then go ahead and winterize in ethanol, distill their cannabinoids, and crystallize in pentane
I’m not going to claim one CANNOT make solventless CBD isolate, but I’m certain the folks you’re purchasing from are not making such a product.