Almost certainly. We can say for certain that at some point there must have been life on Venus for phosphine to be present. Even if a super rare reaction has occurred to release it from Phosphorous anhydride, there must have been organic matter with a respiratory process present for it to occur in the first place. Whether that was billions of years ago or is current is the real question.
There have been some really interesting releases of info that would have been massive news were it not for the world panicking over a cold. There seems to be visible life on Europa, one of the moons of Jupiter, according to a largely-ignored NASA document released in June.
A million great ideas...