That would make perfect sense to me.
I have also noticed that Babicz bridges have been extremely hard to get lately. The shops that used to have them readily available no longer have them in stock. I had to wait three months till the one I ordered finally showed up. When it did show up, I noticed it came in a completely different package. The earlier one came in a nice box with foam. The new one is wrapped in a cheaper blister. And the bridge is not produced in USA. (or were they never?)
Babicz is relatively small and if Gibson owes them a lot of money, they could be in real trouble, especially since it's almost certainly unsecured.
I'm fairly sure they were originally made in USA, but since you mentioned it, I looked on eBay and found a pic of a Babicz tune-o-matic guitar bridge in the blister packaging with a view of the back. It does say Made in Taiwan. Nothing wrong with that as long as it's a Made In Taiwan price. But they're more expensive than USA Hipshots.
Wouldn't you be able to see the impression the larger Babicz would make in the wood under the 3 point if it was changed out?
Probably.
Simplest answer is pre babicz NOS or, as you suggested, Babicz no longer shipping to Gibson (whether due to the bankrupcy or whether Babicz is having it's own supply issues as Rob is suggesting).
The bass is listed as a 2018 and Babicz has been standard on the SG Bass since 2015, so I don't think it could be pre-Babicz NOS, especially since the bass in the listing is in a new finish for 2018. Soon there will be a full list of Gibson creditors, it will be interesting to see.