Google play store reviews: For an older version Whilst reviewing a certain application  on Google play store I came across an odd comment "For an older version" which  seemed to have originated  from several users and this  confused  me whether all the users had  posted the same comment complaining the "old version was better" or it means something else.

It is specifally from users of maybe has something to do with the developer, but either way this still remains vague to me. I just wish to know what exactly do they mean with such a review comment?
It simply means that the comments posted by reviewers pertain to older version of the app , immaterial whether they are good or bad

Other comments which don't have this comment are for the current version, so that's what you need to pay attention to (Bugs in older versions may have been fixed as is usually the case)

As clarified in this SO question, there can be only rating for app by a user , irrespective of the versions. Hence the need to differentiate old reviews from current version reviews

Seeing wbogac z's comment, found this blog which mentions that their is a separate versioning that is not visible to the users and older reviews are likely based on that. 

Edit: See this for versioning details from a developer point of view 
App updation- Google Play Store wants to update an older version of app when latest version is already installed?

Requesting developers to confirm or correct