And obviously, that photo is from quite some later when Geddy DID own several Rickenbackers and had modded the P bass in question.
I present the video from Laura Secord Secondary School filmed on April 1, 1974. Bear in mind the first Rush album was released March 1, 1974. I think it's an absolutely safe assumption that the P-bass in the video was the one used for recording the initial album, since the band had yet to score any big endorsement deals.
To make it very simple, watch in HD, fast forward to the 30:57 mark and a few seconds after, watch Geddy's flamenco technique during Working Man, and notice there is clearly NO j-pickup installed at the time.
RUSH, the first album, was recorded with a Precision bass without modifications. Aggressive playing and fingerstyle, great eq'ing, tube grind, yes. Rickenbacker-type growl, yes. J p'up? No.