On the Papers without Code page, however, I see only 11 submitted papers, out of which 5 have been marked as resolved: https://airtable.com/shrWz8OF3uMZ8G4cY/tbl5ZzB7ahIui1EoD

This does not seem very good data to empirically underlay the claim of 50%-75% papers being irreproducible. I don't doubt that there are (too) many of them, but having some real data before making strong claims about numbers would be more credible.