The illustration is
B.S. lacking.
The illustration are angled relative to each other but both depict zero angle of attack. The presuption is that the vortexes generate at an angle of attack. This is not compelling.
It also ignores the hair follicle turbcles on the humpback's jaw. Those are even more mysterious. Humpbacks are powerful sound emitters. Poerhaps there is an acoustic function.