Eh. I’d mostly agree, though because you can use the output of an HDL to “program” an FPGA or CPLD, I’m not as much of a stickler on that particular semantic.

Weird that you included VHDL but not (System)Verilog, given that I believe the latter is more popular

Just to FYI: Silicon = semiconductor metal, Silicone (with an “e”) is the rubber your spatula is made from.

Also, with no disrespect to your friend’s work, we already have many materials we could use over Silicon, but silicon is cheap, abundant, and relatively easy to refine. Many of the other materials aren’t, so even if they’re faster or more power efficient they’ll never see the light of day because they’re economically infeasible.