.And there is no reason to doubt the Chinese in this matter, unless you (or someone) dislike Chinese and are allowing that to cloud their judgement
I do doubt them very much, they don't tell what kind of technology they are using, allegedly they use some 'hand held' devices, one sound engineer familiar with the technology to search for ping signal burst in laughter when found out about it. Anyway, they show zero transparency. I doubt whatever they heard had anything to do with the signal source picked up by Ausies. Chinese may be too eager to feed their domestic propaganda market - this could cloud their judgement so there are very god reasons to doubt them.