The only one I don't like is Z is for Zulu. I've never heard of that word before and it could easily be mistaken for Hulu. Z should be changed to Zebra.
Zebra is much closer to Sierra and Papa, than Zulu is to any other word in that list - they are specifically chosen to be distinctly understandable in difficult-to-hear situations. And should they change it every time a new brand gets popular that's kinda similar to one of the words?
Ideally, these words are distinct even when most of the audio data is missing (as tends to happen with very bad connections/dropped packets). Worst case is only the "vocal" sounds coming through, as those are very common. Some people pronounce "zero" similarly to how "echo" is pronounced. "Zulu" has no such overlap.