Complete and utter overkill. Must be Corporate member of AOPA - why? Must be completed at ATO that provides FI course - why? This wasn't always the case. From the link "it would allow an FI who may have lost his licence to continue to teach PPL / LAPL / NPPL subjects on the ground" - S/he could do so without such certificate! I also note the course cannot be used as a credit towards any other EASA Instructor certificate, and then there is the small matter of cost - £1800!
Sometime ago I was 'registered' with AOPA to provide this course (Still got all the material that was never updated) but I do not recall too many people wanting to sign up for it.
Pretty sure AOPA could provide this Certificate without all the whistles and bells.