few pages sooner it says IAF can be intercepted for Precision approach plus minus 90 deg and NPA plus minus 120 deg.
Is Jeppesen really talking about the IAF and not the Initial Approach Segment of the approach (the part between the IAF and the IF).
PANS-OPS (volume I, part 4 section 3.1.2) says:
Normally track guidance is provided along the initial approach segment to the IF, with a maximum angle of interception of:
a) 90° for a precision approach; and
b) 120° for a non-precision approach.
So the rule relates to the track
after the IAF and is a restriction on how the procedure is
constructed – not on the way it is flown. If the procedure has a particular track from the IAF to a point where the final approach course is intercepted, the intercept angle must not exceed 90/120°.