While that's a valid question, even if OP successfully defends himself, there's still the issue of marlboroza not being active. I guess someone on DT could leave a counter-feedback, but OP really ought to have spoken up when the accusation was made.
I don't think counter-feedback is still valid with the current trust system, other user can leave a neutral feedback, but still it doesn't clean off the negative feedback.
I know OP admitted to having other accounts already but the lack of address connection to the other alts was bugging me so...
The post where the @OP accused for using that address was happen on 2016, but all of post where archived by forum members were started since 2018, so it seems no way to track it back.
There are many DT members on that thread and they're still trusted until now, if marlboroza wrongly accused @OP, other DT users should've pointed it before.
I think the @OP creating this post right now is on purpose because he know marlboroza is inactive, so he think he will win.