Found the video with comparison of the intro’s.
It’s not a note for not rip off - but given the “similarities” of a song that was a. Released just 18 months or so before Stairway was written and b. Played by a band who opened for Zeppelin on several dates - playing this song nightly - the liberties taken with “borrowing” are a little too great to ignore.
Never mind Page has a long history of taking bits and pieces (and more) from long dead musicians, speeding them up a bit and cleaning them up and calling them his own. He knew damn well what he did (even if unknowingly in his subconscious) and should have at least made it right with Randy. But being the ultimate cheapskate, having Peter Grant as a manager and Atlantics legal team at your disposal has its advantages I guess.
I still love Zep and Page and all they did - but this one was blatant theft.