They can’t delete, even if they wanted to, and they’re not going to want to. They will report it as paid in full, if that’s what you intend to do. That’s the most they can do.
Their contract with the CRA requires accurate and timely reporting. The only way that they could effect a deletion is if they said their original report was wrong or that they could no longer verify its accuracy, both of which would be untrue.
For them to act on a request to pay-to-delete, they violate FCRA as amended by FACTA. There are presently posts in the Debt Collections forum on the same subject (with the same answer), if you need to read them. Otherwise, you might want to use the “search” function to investigate further.