How to - Analytics Platform - Matomo should probably be modified or removed now, since Feedburner no longer has an API.
Haven’t checked if there’s an API for FeedBlitz yet (the service I switched to from Feedburner)
Thanks - I removed the link from: List of Features in Piwik Analytics - Analytics Platform - Matomo
and edited: How to - Analytics Platform - Matomo
we are now looking for funding for this feature which could be built, at least for basic usage tracking (not clicks), quite easily I think 
In the FAQ section #62 about action_title_category_delimiter, maybe it could be usefull to mention that it wont change a thing for archived data and the archives tables need to be droped.
Thanks.