A couple of thoughts, I don't know you or what else you have posted but here are some things that come to mind...
(What is your pre req GPA? I think that would help us give you better advice. I'm assuming 3.09 is a cumulative)
1) it looks like the ONLY class you will complete that will count for PT application is A&P I and II. How are your grades in Chemistry, Physics and other classes as required? If they aren't high, then that will be another year of MORE classes in addition to your PTA degree to even apply. In my mind, this is NOT a post-bac path at all. But, like other posters said, that doesn't matter at all.....PTCAS will average all your scores together and specifically look at your pre req GPA.
2) This PTA school does not appear to have a biology department. Is it a community college? I can't tell....but I would specifically call the PT schools you will apply to now and verify they will even accept that particular A&P course. It would be a big waste if they don't.
3) I've been in your shoes....started with a 2.5 GPA out of undergrad. I applied and got in with slightly over a 3.0 cumulative BUT I had straight A's in all my pre reqs/retakes. It is much more efficient in my mind to plan 1 more year of courses. Load up on every science course you need, retake everything, do a full load for 2 semesters and get some more hours. Retake the GRE if needed. Then you will be ready to apply again in a year, versus at least 3 years going the PTA route.
4) Being a PTA is an admirable goal. But I don't think it's a stepping stone at all towards a DPT. It's not going to help your application other than bump your overall GPA (which you can do in many other ways) It's more like a separate path. If you want to be a PTA and think you will love it, go for it! But if you really want to be a DPT then why not do that?