Who knows but any 'answer' anyone could give is pure speculation.
You could be right! But I do see this claim come up every time Chinese tech comes up. It might be a valid concern but it might also just be folks attempts to try and undermine the technology gains of the nation.
The ISA they have developed with based off years of with with MIPS and RISC V, so it isn't entirely new but they are definitely pushing it forwards. I have no idea if any of their developments could be back ported down the RISC V.