No, the main driver for the price difference is that this is a "traditional" vaccine produced using existing technology, while Pfizer/Moderna are newfangled mRNA ones.

Also, all 3 have made various noises about not making a profit etc, it's quite hard to sort out the marketing from what will actually happen at this point. Oxford/Astra have committed to supplying at least 100M doses to low-income countries for under $3 though.