The calculation argument is that prices reflect subjective values.
The knowledge argument is that there are orders of knowledge that are only discoverable using markets.
Yes, even these bastardizations of the arguments have issues, but I think it's at least an improvement.
WHY DO THESE TWO KEEP GETTING HOMOGENIZED TOGETHER? More than that, why do they get homogenized into a completely different argument?! Most of the time, it gets homogenized into, "The human brain is deterministic; therefore, we can model it; therefore, an objective utility function can be defined, and we know that calculating a utility from the human brain is difficult, but we can solve a massive linear programming problem–Mises just pointed out how difficult that problem was" That's not the calculation argument. It's not Hayek's knowledge argument. It's infuriating how often I hear this.
I am henceforth calling this argument "The socialist's strawman."
Anyways, what gets me is not only that it's a strawman, but it's a very, very weak strawman.