how high is the tolerance for such a specification in the development plan?
There is no "academic quarter," maximum 0.60 m means: "maximum" = at most. That is a binding value, no basis for negotiation, no calibration tolerance like with a speed camera; "0.60 m" = sixty centimeters, not sixty-five. If it is slightly exceeded on a fraction of the length because the top of the wall aligns exactly even though the terrain dips slightly in places, no one will object. But if an entire street full of sly gamblers deliberately pushes it up to seventy centimeters, the city council will hold a special session and issue a series of demolition orders. You should not rile up the bureaucrats by abusing their principle of appropriateness. Also, don't forget that municipal elections take place every five years: the next building commissioner could be a hardliner.