"I think I enjoyed it all because there was always a short-term achievement to unlock: I sorted the five original Pascal programs by complexity and was driven to implement the minimal set of features to see each run in turn. "

so the 5 were running 11 month ago !

This obviously isn't an ongoing project that will be continously updated - this is some guy's hobby project which is more or less finished now.

I don't know what you were hoping for? Someone maintaining a Turbo Pascal compiler on their free time for no obvious purpose?

Maybe the project is done. Software can be done at some point.