Hello!
I use diff command to compare files in two folders (e.x. diff -r "documentation/public" "compare_repo/documentation/public" -u -X - > public.diff || true).
If I generate a report using diff2html-cli for the public.diff result the report will always show that the files has been renamed because their patch is different. But that's OK - their patch will always be different because I am comparing different folders. For more information please refer to the screenshot below:

My suggestion is to add an option to (partialy) ignore patch difference for compared files.