If you can log in (and sometimes even post) you can certainly post an update as well, here and there.
I have a similar opinion. It's understandable that you can be busy with life and unable to count posts and manage the campaign, but if you have access to the forum writing a short message to people who you owe money shouldn't cause a problem.
Not really, no. This is you making conslusions based on putting yourself in this scenario. I log in without 'remembering' or even knowing my password for example.
But it's still you logging in, choosing bitcointalk from your tabs, or writing the name in a browser and confirming your password. It doesn't happen in the background while you're sleeping, or lying in a hospital bed with broken arms.