That’s unlikely to be the case id have thought. All people have done is updated the radio channels again via a rescan. Everyone is on the same MMI software version, as whatever their vehicles were on before.
it’s more likely the broadcasting frequency has changed. I don’t know who we would get in touch with to find out. I’d wager Audi or someone else has contacted whomever to do this.
Now the chipset can decode the DAB radio broadcasts. Either that or they have regressed the changes made at the end of March.