No, the contact will still count for the Colorado station, even if the other station doesn’t submit a log. We encourage all stations to submit a log, but it is not required.
Yes, self-spotting is fine. And it’s ok to post on social media. In the spot comment, mention “COQP”.
If you’re doing both a POTA/SOTA activation and the QSO Party, your spot comment can say “COQP and POTA”.