Um, if you'll pay attention, he's been able to post again for a short while.
In fact, check out his thread on the lack of evidence for adenine on the murchison meteor.
He got suspended for a week because he asked mike the wiz to post a new "summary" in a now closed thread while he was suspended. Admin moved that to a month after he was suspected of arguing yet again through another poster. After finding this wasn't the case, the suspension was reduced to the original week. The original suspension (1 day, as I recall) came because after giving a "summary" in that thread, he continued on debating after have been told, expressly, that people were to only summarize (the thread had but 12 messages left and was very active)
People are suspended for not following the rules, longer for brazen flouting of such. Asking someone to debate for you, while you are suspended, is but a variation on creating a new profile while your original is suspended so that you can continue to debate. It shows an immense disrespect for the rules, and as such, should be treated harshly. Anyone doing such deserves this.