Because the main influence on Wano isn't Dragon Ball Super, its just modern animators generally.
I have no idea why people think that Onigashima's fights was due to a surge of Dragon Ball Super animators on the series.
Dragon Ball Super ended over a year before Wano even started during WCI.
The main crossovers were Tu Yong Ce, Tatsuya Nagamine, and a few animation supervisors who originally came from One Piece anime.
What actually happened was an influx of free lance animators with more modern approaches coming from a variety of series.
Or in some cases, just Katsumi Ishizuka, who I think worked on Dragon Ball a grand total of one single time throughout his entire career.