I highly doubt it. I can’t think of one case where Ford has gone back and updated older models with the newest firmware. Especially since it appears this is different hardware too with more RAM. Someone will figure out how to DIY it, but coming from Ford officially? Not a chance
https://www.lethalperformance.com/ford-performance-carbon-fiber-front-splitter-matte-2024-2026-mustang-dark-horse-m-16601-mfm.html
Or you can go the really expensive route
https://www.i-5autohaus.com/product-page/i-5-dh-style-front-bumper
These guys sell an entire replica front bumper. You can ask them if they’d be willing to just sell you the splitter. I assume it will fit OEM since most likely these are made on the same molds as the OEM haha