I guess this really happened, Alfa sponsored the autocross at Bimmerfest 2019.
It may have been a last minute deal. This post from Autoguide.com is the first I heard of it and the event is in our backyard, sort of.
Here's a report. How Alfa Romeo Stole BMW's Thunder at Bimmerfest 2019 - GTspirit
Paul Blankenship AROSC
76 Alfetta GT -Track and daily driver; 88 Milano - a continuing project