My friend at google isn’t 100% sure what’s happening
That is very obvious!
Maybe you should consult the google search engine itself, instead of your friend.
Enter this in the Google search bar:
site:ampr.org
This returns 17700 results of all kinds of different sites below .ampr.org.
You see the domain names
xxxx.ampr.org listed in the results.
So there really is no problem indexing
ampr.org sites.
I think what you encounter is the difficulty to add a NEW site to the index, not any
generic
problem with .ampr.org.
They probably aren't that eager to add a new site, of which you specify only a start
URL, to
their index. And rightly so. That capability was likely abused widely.
Instead, you should (ask to) put links to your site from other sites relevant to the
subject
of your own site. E.g. the page of your local club, other people's private sites,
etc.
Then, after some time, indexing will occur.
Rob