Looks like simply a "round turn and two half hitches", an excellent knot that's been around forever but doesn't seem to get much respect. Except this fancy new one has more "round turns" and with a "figure-8-plus-carabiner" replacing the "two half hitches".

If you don't want to mess with a carabiner (like when you don't have one!), but still want something super-secure, you could just make 3 or 4 round turns and finish it off like a buntline hitch rather than with two half hitches. Slip this finishing knot if you want it to be easier to untie in an emergency (or for whatever purpose).

The round turns give you the strength and take the load, so you don't have much tension on the finishing knot.