Article 2 of Regulation (EU) No. 965/2012, as amended by Regulation (EU) No. 379/2014, states that:
'Introductory flight' means any flight against remuneration or other valuable consideration consisting of an air tour of short duration, offered by an approved training organisation or an organisation created with the aim of promoting aerial sport or leisure aviation, for the purpose of attracting new trainees or new members.’
Approved Training Organisation = ATO or possibly TRTO
RFs are not approved under any current legislation and never have been.
DTOs don't exist yet.
An Organisation set up for the purpose of promoting sport or leisure aviation would need to be recognised as such.
Unfortunately, IN 2015-029 is a confusing muddle as it has combined Introductory Flights and Cost Sharing, which are two totally different concepts, in the same document.