i know some one who only fly microlight on an EASA PPL and get it signed ,bi anually by an Examiner after a bi annual in a microlight , no GST NO LPC ,NO time on a Group A ,have they got this wrong or has it changed??
Flight time in microlight aircraft is NOT acceptable for revalidation or renewal of SEP Class Ratings included in a Part-FCL licence - and the 'Examiner' should know this! Neither does a 'bi annual' in a microlight aircraft meet the refresher training requirement.
Your 'someone' must fly a renewal Proficiency Check in an SEP aeroplane with a Part-FCL FE in order to exercise PIC privileges legally.
It is likely that Part-FCL will soon recognise flight time in microlight aircraft for SEP Class Rating revalidation purposes, but the refresher flying with an FI will still need to be in a non-microlight SEP Class aeroplane.