I have known about PTNA but never looked too closely into it. I get the impression that it’s designed for much smaller GTFS feeds like a single city, whereas Israel has a single giant GTFS feed for the entire country. I hope PTNA will be able to handle that gracefully. I guess the maintainer of PTNA will be able to answer that 
Great, I am already working on the code to make the change. Since it might need refinement I’ll run it on the dev instance first, hope you can take a look when I do.
The GTFS wiki page is definitive about preferring the latter, see Interpretation of deprecated gtfs:feed=* and other “Interpretation of deprecated” subsections on the page. It seems this info was added in March 2024 with the comment “Incorporate approved proposal GTFS tagging standard” so I think it’s up to date.