I agree with you. That's a feminist issue and the feminists are surprisingly quiet. While there's some grumbling from the professional female runners there should be more considering track is their livelihood.
But EPO and steroids do make a difference. They don't have to make someone faster just train harder, longer, and recover faster. It's a fact and was made clear during the many years coverage of Lance Armstrong's PED saga.
Houlihan isn't dirty but she looks muscular and cut and runs with a strong stride but there's a backstory behind it (including a mother who was a world class marathoner moved to Arizona while she ran for ASU, how she ended up at a second tier distance school like ASU, a blood disorder) and it boils down to a very talented American runner who has somehow entered her peak competitive years with a fresh mind and body.