So the assertion that it is LAPL only isn’t strictly accurate.
According to the Rgulation it is:
FCL.915.FI FI — Prerequisites
(2) hold at least a PPL(A) and have:
(i) met the requirements for CPL theoretical knowledge, except for an FI(A) providing training for the LAPL(A) only
It is entered in the holder's licence.
Don't confuse the priviledges of seperate qualifications.
Teaching IR is a privilege of the IRI qualification for which 800 hours under IFR is a prerequisite if not a full FI; the ME is a privileged of the CRI(ME) qualification. Night rating traing would be restricted to holders of a LAPL only!
Additionally, FIs qualified under the old National, before CPL knowledge was a requirement, have grandfather rights so may not have CPL level knowledge.