The article linked within has audio examples from the study

https://www.sciencenews.org/article/ai-new-sperm-whale-commu...

Also some critiques from three other scientists

The comparison to vowels is “completely nonsense,” says Luke Rendell, a marine biologist at the University of St. Andrews in Scotland who has studied sperm whales for more than 30 years. “There’s no evidence that the animals are responding in any way to this [new pattern].”

He notes that each sperm whale click isn’t just one tone but several in a row, and this can introduce ripples into a recording that aren’t present in the original. These ripples can look a lot like the pattern the CETI team found. He thinks the researchers didn’t do enough to rule out the possibility of recording artifacts.