Yes, those are my meshes. You're very welcome to use the meshes. (That's why I uploaded them to OH in the first place ) I declared the meshes public domain so that people can use them in any way they want.
I would however request that you re-name any files if you change them (or put them in some sub-folder). This is just to avoid the problem of overwriting of the original files.
I'm sorry that I haven't had time to add more stuff to that collection.
Good luck with your addon!