I guess it is a difficult decision for the mods, but it is important to keep meta on track, and not fill it with just a couple of topics. I can see why such threads are moved to reputation, as accusations of lying and malpractices against specific members are really attacks on their reputations.
You need to clarify 2 points.
1. This specific meta suitable discussion only needs to be discussed thoroughly once. Either it is okay for DT1 to use provable lies as a basis for red tags or it is not.
A hypothetical example would be if I lied and said you have left a red tag that states I scammed you out of 10btc. This is provably a lie.
2. If they are provable lies then they are not simply accusations. They are statements of truth.
However there is no need to even get specific to certain members unless other members ask for an example.