Audi is pulling back on other forms of motorsports to focus on F1.
"According to multiple sources, Audi’s board of directors led by [CEO Markus] Duesmann decided to put all its weight behind the F1 project already in 2021, long before even its grand prix entry was finalised.

It is understood that the board finally issued instructions towards the end of last year to close its customer racing division following the conclusion of the 2023 season. Audi Sport Customer Racing includes the GT2, GT3 and GT4 variants of the R8 LMS as well as the TCR programme with the RS 3 LMS."