Illustrative example
A parent has been turned away at the door for most of the scheduled weekends since the spring. Out of frustration they stop the child support payments and say they will resume when the visits do.
The section lets a court suspend alimony or maintenance - money for the adult - where a custodial parent receiving it has wrongfully withheld visitation. Its last sentence then says that nothing in it is a defense to enforcing child support or grounds for cancelling child support arrears. What decides this is the kind of payment that was stopped, not who is right about the weekends.
The support payments restart at once and are treated as separate from the contact question; the missed weekends are made up from an agreed list of dates rather than traded against money.