Yes, Shaarli "remember" if you already bookmarked that same page. It will popup your previous notes and tags about it, which is definitely cool to update / review your previous informations.
As you noticed, there's a more up-to-date github repo there, but still, I prefer using the old one for several reasons:
1/ I got problem installing the new version on my shared host platform (it didn't work). It looks like the server configuration is more complex, I don't have Docker, and I couldn't use composer for php dependencies.
2/ I like the old theme better
3/ I didn't see any of the new features to be useful for me
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Sorry for the late reply,