Based on videos of "Danjin mains" players playing Wuthering Waves while blindfolded, with a taiko controller, a dance pad, a guitar controller, etc. (not at the same time of course).
Couldn't find the videos at the moment, unfortunately.

This post on Reddit is probably what the dance pad is a reference to. It shows up the most while trying to find related gameplay videos.

VR-Man said:

Based on videos of "Danjin mains" players playing Wuthering Waves while blindfolded, with a taiko controller, a dance pad, a guitar controller, etc. (not at the same time of course).
Couldn't find the videos at the moment, unfortunately.

"Not at the same time of course"
Stop tempting them.

Ayumu_WT said:

"Not at the same time of course"
Stop tempting them.

https://www.reddit.com/r/WutheringWaves/comments/1is5rn1/danjin_solo_no_hit_run_vs_lvl_100_fallacy/