What _is_ obvious from this is that the ULBs should be encoded somehow so that there is no doubt what is being heard is a particular aircraft. This is not difficult it could be a modulation or a pattern of pings - that would prevent all these rumors and doubts.
Why? How many active ULBs do you imagine there are under the sea at any particular time? I don't imagine the searchers are in any doubt about which aircraft they would belong to, and nor are they particularly troubled by the rumours and doubts of keyboard warriors on the internet.