1 out of 2 for me
1- They had some kinda leak or loss of fuel. Or even wrong reading of the tanks.
2- They exagerrated the situation. No have 20 minutes?
Why do you declare fuel emergency when you didn't get vectors around, you didn't have to hold anywhere and I don't think the taxi over LAS was that long so they spent many pounds on ground...
I'll get this audio by recording that website and try to find Minnie audio and see how it went later