I've owned both the hexagonal pattern and the new solid pattern stuff, and the new stuff isn't printed like the older stuff was. You can sometimes find some "transition" stones that he made where he experimented with making a solid surface by printing an extremely dense hexagon pattern that was mostly solid, but now they're more like an extruded sheet.just from pics of his previous stones (what you call the 'hex weave'), i surmise he FDM prints his 'stones'. he likely bought small-scale filament extruder equipment. probably just dumps diamond dust into the melter along with the plastic pellets.
that new texture looks just like a rough print plate texture, i.e. you're looking at the bottom layer. scroll down to where they have a video clip of a blue cube.
sounds like obfuscation-speak for PLA, lel