in the voice of Elmer Fudd
'vewy intwesting'
trying to write this without confusing even myself, given I have spent time teaching this.....
The error in the ERSA definition seems to be lack of conformance with accepted terms.
Looking into the ERSA entry you have posted, leaves open the door to 2 different TIMES.
LMT (Local Mean Time) is a valid terminology and has meaning.
Local TIme. Has no definition in ICAO or any other structure.
Your final sentence is very correct and there is a a short for it. and thats LST (as taught at BAK,PPL and CPL level)
Local Time does not exist in the syllabus, but Local Mean Time and Local Standard Time do. both must be taught and understood.
I don't have a current ERSA handy, but if you can find an entry where they use the LMT abbreviation, post it for further analysis...let see what they are publishing
Cheers
Jas