I looked up the PA rule and I think you’re misinterpreting this. The first sentence means they WILL be penalized for holding any out of season practices, whether inter school or not. The football quote refers to physical contact, which is blocking or contact with pads, not coach contact. Or maybe you accidentally copied the wrong section.
From the PIAA Handbook: Schools may NOT hold practices out of season. Coaches MAY train or coach non-school teams as private citizens provided no school players are required to participate.
See ARTICLE XVI SEASON AND OUT-OF-SEASON RULES AND REGULATIONS
https://www.piaa.org/assets/web/documents/Handbook - Section I - Constitution and By-laws.pdf
I want to make sure I'm clear. I'm talking about open gyms/fields, totally voluntary, not anything like an official practice. If my previous post was unclear, I apologize. Yes, I understand there are clear guidelines for official practices.
I do appreciate the response. Definitely not trying to break any rules!