For those of you who are saying this isn't multislotting, Sebastien Felix, who has an excellent yet largely
unknown website, has this definition of multi-slotting on his website.
"What is multislotting?...Basically multislotting is just a state of mind, where you don't dumbly solve the F2L pairs but try to do the smartest solve you can. It is based on the fact that there are many different ways to insert a prepared pair, and every of these different ways affect pieces differently. Working on multislotting will allow you to influence your next pair when pairing one. Sometimes cases are so fair that you can prepare your next pair while inserting one. And happily those cases happen very often when you work for it."
In that sense, what Weston does really is "multislotting".