Hi yeah, `addr:lot` is a more recent addition so it might not be widely supported or tagged but it is valid and it does represent the actual address of the houses correctly.
While the older tagging methods are *also* themselves, valid but as you can see even within the blog posts, there are variations within them with their own pros and cons, personally I believe its whether you want to go for it being easily searchable or having the right addressing on the meta level.
Cheers.