This rule doesn't apply if the project follows the rules of all the jams the submission was posted to
This is what you said yourself. So it was not because spam because every Jam I submitted it to was especially for that. This too it is a endless runner so in my opnion is this a loop.
The only other thing I can think of if it is because I made the page just befor the start of the jam but it is still in development. But correct me if I'm wrong I thought I read on this one you could start 4 days earlier. If it was not yours then I agreed with the disqualification. But not because of spamming!