"Hoarding" mistakes - that is, not reporting them because they're in your favor - or rejecting direct developer input is generally considered poor form, and is just going to prolong arguments.
As I've no idea from where this information is taken, I cannot say what is/is not a mistake. There is no canon publication for many of them, outside of RATs. Which means that the data is either taken directly from a RAT, or from the developers'/authors' notes, or some other source which remains unpublished. Which is why I have not posted anything further. I'm not "hoarding" anything. Without more information on the MUL's sources, or feedback on the things I
have posted, I cannot fact-check or post (possible) errors.
My follow-up question would then be, "what are the sources being used to determine availability?" Or, just narrowing it down for illustrative purposes; "what was the source of the
Warhammer WHM-6Rb availability?" The answer to that would go a long way in helping me/others fact-check things and submit potential errors. :) If we don't know what sources are valid, how can we check them?