I would guess we all know that abusive NRP's often use contact and the courts to further their abuse it's something that is quite widely known and has been in the media a fair bit of late.
One of the reasons it is such an effective method and it works so well is often because people experancing it get into a cycle of behaviour where they respond in certain ways and often enter into a control battle.
The unfortunate result of this is nobody sees the parent who is not meeting a childs needs not meet them and the victim of the behaviour ends up presenting in a certain way that is not conducive towards the behaviour being stopped.
Example
Child dropped at school by NRP with no uniform and no lunch
RP facilitates the arrival of uniform and lunch
Result child at school with uniform and lunch this in essence means nothing newsworthy occured.
RP does not facilitate uniform and lunch
School have to raise a concern about lack of lunch and uniform a uniform is cobbled together in school and a meal is provided.
Result child at school with uniform and lunch BUT something has occured and has been documented meaning RP has something newsworthy.
RP at some stage in the future ends up in a court.
RP's case he's often late back
NRP's case she's putting obstacles in my way and being controlling over time.
Now thinking about it logically from the perspective of someone who listens to two side of a story when one side is placing much emphasis on 5pm and half an hours or an hour here and there with one no harm done next day return (if no concerns raised)
With the other who most likely is charming and has no reported incidents against him and the law says he has just as much right as the RP to decide on everything child related.
There is also the end goal result to consider, if he's doing stuff like this to bug the op and the op is not phased by it then it will be pointless.