No idea why you are pursuing this with such vigour & a hint of venum - RAA 19s are the sole responsibility of the owner to maintain/or have maintained in an airworthy condition. The recommendations of the component parts supplier/factory are just that, recommendations. This not a certified or factory build aircraft, the rules for such do no apply.
If you acquire an aircraft (of this type 19) that has its genesis on the other side of the World, you do so with the understanding that factory support is likly to be nominal at best. How you interpret and act/or not, on factory recommendations, is up to the owner.
Your "freinds" aircraft has been flying for about 30 years (l forget the actual rego date) was involved in one major accident - your friend purchased the damaged aircraft "as is". The photos, he has sent me, suggest he has done a terrific job in rebuilding it. I believe he has had it inspected (RAA?) prior to returning it to flight. He seems to be very pleased with his acquisition and confident that it is airworthy.
I understand that your "friend" had a Zephyr, prior to acquiring my one. I don't know how long he had it for however if he is on the second model, it suggests a depth of posative experience/knowledge of the mark, that could easily exceed mine.
Although no longer an agent for ATEC, I continue to be an admirer of the aircraft. As such I am happy to assist owners where I can - what more do you want? 😈