I suspect this will get written up in a paper relatively soon, but it's too new for the journal wheels to have turned far enough yet. The original ... publicization, if not publication ... was in a post on the conwaylife.com forums, and there's some more detail there on the general method:
https://conwaylife.com/forums/viewtopic.php?p=140258#p140258
The previous "Grand^N Orphan" result involved a complete enumeration of the relevant 6x3 agars, but this "Unique Father" result was a partial enumeration of 6x6 agars, I think, just until a working example was found.
At least one independent verification has been done:
https://conwaylife.com/forums/viewtopic.php?p=140277#p140277