Wow seems like they really pick these battles to only be the most important issues.
But for this translation feature they have not even mentioned any regulatory issues, so we should from conclude, from previous and current behaviour, that Apple is delaying for something else. Probably engineering or political reasons.
[1] https://www.macrumors.com/2025/09/12/apple-delays-iphone-air...
You have no source for this claim.