I believe the author of the article has got the wrong information.
The example labelled as "genuine" in the cutting is a forgery.
It's both Ceresa's and Barefoot's "First Forgery".
Many articles have quoted one by Varo Tyler in 1983 in American Philatelist
on this point (identifying the "First Forgery" as genuine) but he changed his view in a subsequent article in 1984.
I like the misperf.
In my experience most of the eagle stamps are reprints rather than forgeries.
There are at least three different forgeries.