I agree that it's a lot of unnecessary risk for this to be J-20 so seems unlikely. I just think it feels like a rushed cover up much like the reaction last year with DF-15 overflight. It would be interesting to know if something they feel is embarrassing happened.Speculation that it's J-20s doing flybys close to or in ROC airspace is a bit too much hopium from some people.
The threshold for evidence of that kind of action should be very high, given how risky it would be if a J-20 were able to be detected or even engaged if they did something like that.
I suspect the most likely answer is just ROCAF fighters going supersonic and them not conveying it accurately.
Up to this point in history the general thinking on the island has been that east coast of Taiwan is considered their "strategic rear" and relatively safe area, hence why Hualien has that underground hardened air base for ROCAF to retreat to for force preservation. Presence of aircraft from CSG on east side might be considered embarrassing as it upends their calculation.
I remember last year a talking head on Taiwanese TV said Chinese ballistic missiles have to circumvent the globe and hit them from the pacific side if they want to strike the east side as that person thought the central mountains provided a shield against ballistic missiles. This would be reflective of their whole "east coast is safe" thinking.
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