The politics overhaul was developed with the intention of being included in Vae Victis when it was finished or near to finished and made available as standalone until then to both a) get more feedback during its development and b) show case the systems that Vae Victis offers.
When we release v61 the politics overhaul will be included. Until then you can use the separate Politics Overhaul mod or wait till it is included, its up to you.