ofxHoa does work with the current release of OF. The thing that seems to be broken is just the submodule tag in the repo for the hoa light library. To make it work clone the ofxHoa repo, then go to the CICM/Hoalibrary repo and select tag 2.2 (here is a direct link https://github.com/CICM/HoaLibrary-Light/tree/HoaLibrary-v2.2). Download this and put the source folder from the hoa light download into ofxHoa>libs>HoaLibrary-Light folder. You can then use the project generator as normal to generate the example projects again.
The only caveat is that the tag that works with this addon from the hoa light library is quite old and there are a lot of features missing. The library has since updated to using the eigen library for mathematics and the changes are not compatible, so without a fair bit of work you will not be able to use the latest Hoa library, but the functionality is there.