Being Emessdig is definitely a good Mida, but lying in an ideological conversation does not make someone a Muchzak Shakran or any other scary term. At most, if someone is a chronic liar then he would be from the Kat Shakranim, which is one of the four groups tthat are not Mekabel Pnei Hashchina.
Hin Tzeddek that the Gemara speaks of is about keeping your word in business. Midvar Shekker refers to Eidus, although we do use it as a reproach to lying.
Now, you mention my name and Jothar’s as accusers of AYC. That is an example of untruthful manipulation. You also use terminology meant for cheating people, on an ideological conversation. So, are you Muchzak something?