First, it's not a malware site, it won't harm you or you machine in any way. I don't agree with their recent attempt to ddos, but linking to them doesn't encourage that, you are using their service for free, think of it as a punishment.
Second, if you really think it's wrong to link to that archive, you ought to provide another link, unencumbered by walls. When such is lacking, anything is better than none.
I assume they are referring to an incident where their captcha page was updated to perform web requests from the client machine to a particular blog because the author had been trying to uncover their identity. You can search "archive.today ddos" for reporting on it.