[Plugin: IntenseDebate Comments] Not Valid Xhtml

I have been trying to get through them to make this plugin Valid Xhtml, but when ever they have been able to they have erase my messages (I have posted on facebook and their own website.) But they just keep ignoring me. To validate this thing is as easy to just enter <p> and their code inside </p> that is soooo. I told them, but they just ignore people. Why?

https://www.ads-software.com/extend/plugins/intensedebate/