I can't access the link above, but I bought the cage that's a Garbaruk clone (packaging was even 'legit' Garbaruk).
It is very well made, but does NOT fit the AXS derailleur without a minor modification to the screw that keeps the lower cage from 'unwinding'. You need to shave the head of the screw down a bit so it doesn't contact the clutch housing.
Overall, I wish I had gone with the KCNC SXX1 unit. And I might try it next time there's a sale on them for $10-15 off.