The Bitbucket interface is very different from what most people are used to (GitHub).
Indeed, it seems to not be possible to create a PR from the SpeedCrunch project:
However, digging around for a while I found a way: you must create your fork, then edit it, then create a pull request FROM your fork, pointing to the original repository. It's not possible to create a PR from branch comparison, from a commit, from the fork home page... And not even from the main repo even if you have a fork.
I guess the complainant didn't know how to work with Bitbucket; everyone who's not familiar with it might, indeed, feel that design decision to be very odd.