I'm not going hard on you at all, only on what you've said. The evidence about BPD is that it affects women far more often than men, the clinical data overwhelmingly supports this, and so does the genetic research on the topic. Instead of considering this evidence, you've tried to find some seperate evidence for gender bias, you found the one paper that examines this, and that paper doesn't even really draw any conclusions.

Any time a question is asked about 'why are men and women different in regards to x', you'll have people lining up (like yourself and other commenters in this thread) to say it's gender bias. When the answer is often just because men and women have differences, which is exactly what the evidence points to in this case.