I suspect the whole story, after quite possibly some meetings they asked for in Dublin, has been put around by the ROSCO PR teams to encourage both TOCs and the DfT into a "buy now while stocks last" frenzy. Commercially, doing that seems quite astute.
Amazing that it can be contemplated, and is financially worthwhile, running 6-car 185s on what are effectively Dublin outer suburban commuter services (which is where the growth is), where TPE are incapable of running more than 3-car sets packed with standees on Newcastle-Liverpool peak services (I couldn't even get in one at Darlington one afternoon), which thread multiple metropolitan areas, Greater Manchester alone having a population which exceeds that of Ireland.
I did think that bogies were one of the longer lead time items in rolling stock production. You are not going to get new ones made up over a weekend. It's not just a case of pressing the wheels out a bit on the axles ...