This.

I'm interested in knowing what exactly caused Lutpin to leave that rating, and why i haven't heard about this before despite it being well over a year old.

I'd be a shame to remove mexxer-2 from DT2 though, as that would basically invalid of all his current ratings that he left and possibly untag hundreds of (real) scammers.

He seems quite inactive as of lately  so i wonder how you all of a sudden decided to open this thread? Some unsolved grudges?

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I feel like you're one of the accounts he tagged and thus smell a chance to get the rating to be invalidated. Mexxer might classify as a "Scammer" (although with the evidence your presented it's merely an accusation), this does not (for me atleast) invalidate his previous work/ratings. It'd be a shame if those would go to waste.