I understand your reasoning behind the activity thing, I believe there is more to them getting promoted than their activity on servers as I see them on teamspeak, forums and contributing a lot to community discussions. Regardless, this was discussed with the TF2 staff and I'm sure you'll get a statement about it soon enough.
Remember, things are not set in stone, and any issues that may happen can easily be remedied and reverted if need be. I have a lot of faith in Bello's judgement over TF2 and so do the rest of the higher ups, I would like you guys to give him the benefit of the doubt as well.