Jackson was VERY vocal about his disapproval for the Marshall Supreme Court.
The obligations imposed by the ruling within Worcester v. Georgia was that states (specifically Georgia) could not enact and enforce regulations on Reservations and Native American land because of pre-existing treaties. It was never claimed that the quote is about what decisions were made with regards to Jackson; it was about what decisions were made for Georgia, and that Jackson had no intent to enforce them.
Jackson was very much complacent to Georgia's continued intent to regulate, and later remove, Native Americans from their designated land.
There was nothing to enforce as the court didn't impose any obligations on Jackson.