The science itself is not scrambled.
If you run the numbers on cost, taking in to account feed conversion, space requirements, purification schemes, all that stuff, chickens come up significantly cheaper than the goats or cows.
As for the "likely have advantages" comment. This is old news referring to a paper by Raju et al that demonstrates that chickens glycosylate their proteins with patterns more similar to humans than many other species do, including goats. Specifically, it is a matter of NGNA vs NANA side chains.
I'm a believer in the technology, having spent many years working in the field for a now defunct competitor of VRA.
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