Hello Harrison
I have two Eiraku tsuho the one from the link you put
and this one thicker engraving for this one (two different references)
the engraving is finer and deeper for the Eiraku Tsuho
the edges of the slice are perfect and the framing of the hole is finer than on the Yong le tong bao
and the dark alloy is most common in Japan
It's why i'm not sure that is an Eiraku Tsuho
it's just my opinion I'm not an expert
https://roberts.faculty.history.ucsb.edu/coins/bitasen.html
Guillaume