Aviation bus :
Extract from ICAO Doc 8168 Vol II
3.3.3 Flight Procedures for Racetrack and Reversal Procedures
3.3.3.4 Descent . The aircraft shall cross the fix or facility and fly outbound on the specified track descending as necessary to the specified altitude. If a further descent is specified after the inbound turn, this descent shall not be started until established on the inbound track (“established” is considered as being within half full scale deflection for the ILS and VOR, or within ±5° of the required bearing for the NDB).
I would suggest that the D14 is solely to define the dimensions of the Racetrack pattern ( DME vs time) and not as a descent point . Interpret as you wish .