Always pays to be skeptical in this day and age.
But in this case, one of the pro-pali “debunkers” recognized the voice of one of his compatriots, who was aboard one of the flotilla ships. He himself was thereby debunked.
Have a nice evening.
The IDF originally released the audio, stating that it was an exchange with the Marmara. The activist in question - the only person identified on the tape - was not on the Marmara. This is either a 'an honest, and rather insignificant, mistake' or else an indication of fabrication.
The IDF are now saying that they have no proof that the recording came from the flotilla ship - but this is also very odd, as even on an open channel, they ought not to mix up audio signals from two different ships.
If you listen, the anti-semitic remarks come in suddenly, with gaps which sound very like edits. No one has been able to identify those voices, and for some reason the IDF is not releasing the radio log of the seized ship, which could verify its claims.