The 10th and 11th generation iPads work with _both_ the Lightning Apple Pencil and the USB-C Apple Pencil.
The Lightning Apple Pencil was sold at a time when you could plug it directly into the compatible iPad, and it *came with the adapter*.
The current iPad is compatible with both, so you could use your old Apple Pencil with the new iPad.
You cannot buy a Lightning Apple Pencil anymore because Apple doesn’t sell them.
who knows what third-party retailers are doing.