I personally dislike the way people claim to have delivered a 'conference paper' or a 'poster paper'. They give an oral presentation or they present a poster - any ancillary material for delegates interest (i.e. supporting papers for delegates interest) do not count as papers & merely support the presentation. I personally think that all presentations should have these available on-line anyhow, although for oral presentations, many would prefer to keep the bulk of the content a surprise (not sure if that is the right word).
If in the rare instance, a presenter published a full paper or article in proceedings (& this was the only form of publication), then it is a conference paper. If they give an oral or poster presentation, then any claim that it is a paper, is in my opinion false - there is no collected full body of information available as a point of record, analysis & response.
Many conference 'publications' only appear either as an abstract (or even worse, as a title mention), so give no depth of detail or analysis for others to go by - they are of limited benefit. Should organizers ask for & publish short papers (perhaps on-line) that will provide benefit for those who are not able to engage in direct discussion with the presenter?