Nope. [This][1] didn't work.

<s>Makes sense, since I recall reading that deleted comments leave no trace (unlike posts). They disappear. So any record of you having commented disappears as well--then the @reply won't work.</s>

Looks like comments _do_ leave a diamond-visible trace, so I guess that they are stored in the database. But the SE people have already thought of this and made sure that @replies don't work.