SWIFT is headquartered in Belgium. Only 2 banks out of the total 24 on the board of directors is US banks. Unless there's a hostile takeover of the SWIFT organisation by the US, I think this is a bit of a stretch. (Plot-twist: Italy is on the board of directors.)
"Brazilian banks" were never classified as Foreign Terrorist Organizations. It is a specific designation and law that comes with 20 year prison sentences.