You cannot simply throw money at a lease provider and gain title of a vehicle.
The lease provider can impose other conditions on title transfer (e.g. early repayment fees)
If you're throwing large sums of money at them, they should probably perform some anti-money laundering checks before accepting the money.
If you're paying cash, they may justifiably not want to handle large amounts of cash.
It doesn't seem unreasonable to me that return of the dealer's GPS tracker (and possible payment for removal) could also be conditions on them transferring the title.
The article is unclear on whether the title was actually transferred before the disagreement over return of the tracker.