Chris Moore says Ocean Shield team verified underwater pings (BBC Horizon programme)

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I captured screen images from BBC Two's Horizon programme "Where is Flight MH370?" that show Chris Moore, of Phoenix International, who stated the following, starting at approximately 55:25 into the video:

Chris Moore:
"And we had a detection. Big moment. Uh, are you sure that's what we heard? Are you sure that's what we're, is it not us? Uh, you know. It was elation and panic, and self doubt. Um, wonderment to let's get busy and find this thing. Let's track it down."

Clearly, based on his statements, the Ocean Shield team verified the signal they detected, to make sure it was not them, and to make sure that it was within the specifications for a Black Box Underwater Locator Beacon (ULB). Clearly they did not simply assume the signal was valid.

Yet as we know, none of the four underwater signals they detected were valid, and they were not within the specifications for a ULB.

So if they verified the underwater signals when they first detected them, which he stated that they did, can one conclude that they ignored the fact that they weren't valid?

What other conclusion can one draw, when the Horizon programme described the team as follows, starting at approximately 44:19 into the video:

At the forefront of the search, was the Ocean Shield. A six and a half thousand ton Australian Navy support vessel, carrying an elite team of deep ocean salvage experts.

The  Youtube video for the programme is here. (Let's see how long it remains there, before the BBC demands its removal.)