Look like the US version of SEPA transfers (technology-wise) like (somewhat) described at https://www.europeanpaymentscouncil.eu/what-we-do/sepa-payme... but instead of just SWIFT (which is what is also ISO 20022 supported) its more for internal transfers as well.
I do wonder why the 12-year lag in the US implementation of essentially the same standards (and the same ones they had implemented on SWIFT much earlier) was there to begin with. You'd think that with the states in the US not being nation-states it would be much easier/faster to implement something like this nation-wide.