Unfortunately I doubt that apple has built in native AVB support in IOS.
Technically, it would have to be limited to iPadOS (because there is no iOS device with Thunderbolt). And then, to the iPads with Thunderbolt, because no AVB without PCIe network adapter. That means that for recording, you could only use AVB recording for a limited amount of time, because to the best of my knowledge, there is no way to supply power through a Thunderbolt Ethernet adapter to the iPad Pro at this time - right?
Anyway, also curious if a AVB-compliant ethernet adapter on iPad OS would allow users to discover AVB entities on the network - so if anyone has tried this, let us know! But my expectation is that there is simply the network browser missing at this point.
Is the Digiface AVB compatible with iOS
It is unlikely that one could install a Digiface AVB driver (that handles part of the AVB stack) on iPadOS in the future. iPads always required class compliant USB devices that do not require drivers. So no, the Digiface AVB is not compatible with iPadOS.