As I read the text [1], it does not mandate that anything be
published to the public. All the language is about storing the
code at at least one "public repository or private repository".
The act does mandate that information (metadata) *about* such
custom-developed code be published publicly. That seems like a
good step, even if there is no requirement for any particular
custom-developed code to be made public.
Best regards,
-Karl
[1]
https://www.congress.gov/bill/118th-congress/house-bill/9566/text