You're clearly failing to read the chapter, just like Mr. Kamenriderblaze. The essence of his Martial Art style is to copy and master anything he has knowledge about it's flow of energy on instantly. This was shown many times in the series. Copying and mastering WDM's style, copying and mastering TTM's style, copying Bomb's style, copying and mastering all 11 martial art styles he glanced at, copying and mastering Saitama's strength and speed that once blitzed him, copying a Gamma ray burst, copying nuclear fission.
Goku at best has only learned and mastered a handful of techniques as fast as Garou did: Ultra Instinct, Instant Transmission, Kamehameha, Kaio-Ken, ect.