No, the AIC merely clarifies that aeroplane instructors may also instruct on Microlights because they are legally aeroplanes. i.e. they fit into the SEP definition. The FI(R) can also instruct on Single Pilot Types.
JAR-FCL 1.005 (5) states that where aeroplanes are referred to in JAR-FCL1 it does not include Microlights. This is what lead to the clarification in the AIC; it had been assumed by some that Microlights were a different Class and therefore needed a separate Microlight Instructor rating. NPPL negotiations resolved this issue however; JAR-FCL 1.005 still prohibits you from counting any hours flown on a Microlight towards any JAA licence or rating unless it specifically says so i.e. the max 10 hours credit towards PPL issue.