It was in fact added to the EULA.txt file in 11.6. The header says it was updated October 8, 2021.
% diff EULA.txt-11.5 EULA.txt-11.6 |grep -2 trans
> 8. You may not reverse engineer, decompile or disassemble
> any portion of the output generated using SDK elements for
> the purpose of translating such output artifacts to target
> a non-NVIDIA platform.
That said, I believe 11.6 was released in January, 2022.
