Hit the nail right on the head
The "off premises" bit seems to be referring to consolidating the data centres in fewer locations which are not co-located with the business units using them.
"Consolidating," maybe. Not co-located? "Not co-located with the business units using them," has always been the case. Banking data centers are typically housed in their own facilities, so this is nothing new, although local banking and back office centers often have their own mid-tier servers. They have some serious requirements to deal with being able keep operations up when they are unable to phone home.
The real news in the current story seems to be that they've decided on OpenCompute kit as their standard hardware platform.
For you, perhaps. For me the real story is that they consider the tech involved to be mature enough to use in their production environment. Banks are extremely risk-averse when it comes to tech. Bank of America (or at least its legacy NationsBank bits) for example kept OS/2 on life support far past the time it died a natural death elsewhere.