Application of any law requires discretion. For example, if 6 year old shoots his brother out of anger, the killing is objectively wrong. However, the wiggle room is the child is considered to lack full knowledge of right and wrong.
One can come up with other countless examples where there is an objective evil, but is mitigated by some circumstance (wiggle room).
The challenge regarding remarriage and Holy Communion is whether any discretion exists, and to what degree it should be exercised.
Where’s the wiggle room for adults who commit adultery?
Next thing you know, Kasper will propose wiggle room for consenting teenagers to have sex before marriage, in order to assess their “maturity” before entering into the Sacrament of Marriage.