The D-9 has a MTOW of 320 kg and a stalling speed of 25 mph. It has a wing loading of 36 kg/m2.
The CAA state:
“Microlight aeroplane means an aeroplane designed to carry not more than two persons which has:
(a) a maximum total weight authorised not exceeding:
(i)300 kg for a single seat landplane, (or 390 kg for a single seat landplane for which an individual United Kingdom permit to fly or certificate of airworthiness was first in force prior to 1st January 2003),
(ii) 450 kg for a two seat landplane,
(iii) 330 kg for a single seat amphibian or floatplane, or
(iv) 495 kg for a two seat amphibian or floatplane, and
(b) either a wing loading at the maximum weight authorised not exceeding 25 kg per square metre or a stalling speed at the maximum weight authorised not exceeding 35 knots calibrated airspeed”
The Jodel's MTOW and stalling speed might therefore mean that it is now considered to fall within the Microlight definition. You need to get confirmation from the CAA that any hours flown in the aeroplane would be allowable towards the CPL qualification TT.