The EASA definition goes as follows: ‘Aeroplane’ means an engine-driven fixed-wing aircraft heavier than air, that is supported in flight by the dynamic reaction of the air against its wings. ‘Aircraft’ means a machine that can derive support in the atmosphere from the reactions of the air other than the reactions of the air against the earth’s surface.
To me a TMG could go under that definition but not sure though... Basically I'd like to know whether the 15 hours that are needed to go from LAPL(a) -> PPL(a) can be done on TMG https://www.caa.co.uk/General-aviation/Pilot-licences/EASA-requirements/PPL-SPL-BPL/PPL-(A)-requirements/