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I dont think you know what a fixed point in time is. A fixed point in time is a singular point that cannot be changed, while the events around it can. Eren can have the ability to manipulate causality while also being unable to affect a fixed point in time as a fixed point is inherently immune to causality manipulation.That's exactly what they're telling you. Eren can't change the future, but you choose to believe that the only time in the manga where he does affect time and it doesn't change anything is that it's meant to be that way.
Also the manga is secondary canon, the anime is the primary canon for AoT, and it has numerous instances of him manipulating causality