https://en.wikipedia.org/wiki/Rock_and_Roll_(Led_Zeppelin_song)
Guitarist Jimmy Page explained that the song developed from a spontaneous jam session, while the band were trying (and failing) to finish the track “Four Sticks”, at the Headley Grange mansion they had rented in Hampshire, England to record the track.[6][7] John Bonham began by playing the drum introduction from the Little Richard song “Keep A-Knockin’” to which Page added a Chuck Berry-style guitar riff.[8][9] The tapes were rolling and fifteen minutes later the basis of the song was completed.[10]
“John Bonham began by playing the drum introduction from the Little Richard song “Keep A-Knockin”
Both you and Wikipedia are ignoring, or unaware of, the distinction between starting on the 8th note upbeat vs. the downbeat.
Try it sometime...even experienced drummers can struggle with it.