Implied where? I don't see any such implication. In fact, my impression of Malachor V is that Revan wasn't present at all; wouldn't he have been giving orders rather than the Exile?
@Drakron: I don't think HK-47 was sent to kill Mandalore the Ultimate (hate the nomenclature, but we have to keep them distinct). He was sent after a pretender. We know that there were several, though nobody had the helmet until Canderous. HK-47 declares in KotOR:"You created me shortly after you and your apprentice began your war to conquer the galaxy;" it's also clear that Malak was already DS when HK-47 met him for the first time. My interpretation of this at the time was that HK-47 was built after the Mandalorians were defeated. This is consistent with KotOR 2.
@kalimeeri: it depends on if you buy HK-47's interpretation of Malachor V or not. If you do, then Revan intended to lose that portion of own fleet there. Though perhaps he didn't know about the MSG, and taking out the Mandalorians was a bonus.