MHL was a native thing with the Note 3 and I would assume your Note 4. It should have been as simple as buying an MHL Micro usb cable so yea that listing is scummy as fuck.

Edit: this seems very close to a cable I've had success with in the past. Unfortunately I can't link you the exact cable because it was like 6 years ago but this looks like the same chinesium product on a new listing.

Edit 2: I believe part of the confusion comes from there being two different USB micro b plugs that existed for MHL. There's the 5pin and the 11pin. Older Samsung's need the 11pin plug (I think - you should take it from there googling which you need).