Confirmed it doesn’t work? But why? There’s no entry.jar, only an index.jar and index-v1.jar. Is entry.jar a newly required file by F-Droid? Or does it seem that Collabora Office repo suddenly deleted or didn’t generate an entry.jar (July 23 update, my guess)? The only other thing that looked odd was latestapps.dat file size zero. But I don’t know if that’s normal, or broken but non-fatal.
Edit: FWIW I pinged Collabora Office via website contact form to make them aware of the problem.