There seems to be some disconnect as we all appear to agree that "Lightyear" is supposed to portray a "human" version of Buzz.
Regardless of whether "Lightyear" pre-dates "Toy Story" and is the basis for the toy design, or "Lightyear" stars an "actor" who looks like the toy, in either case "Lightyear" would have to exist in the Toy Story universe, so it would essentially be a "live action" movie to them because Buzz is being portrayed by a "human" actor (It's made pretty clear that, in the Toy Story universe, Buzz Lightyear is a fictional character, so there is no "real" Buzz).
Of course it's entirely possible that "Lightyear" doesn't exist in the Toy Story universe, and is just Pixar making a more realistic portrayal of Buzz Lightyear only for our enjoyment in this universe. My point was that IF it existed in the Toy Story universe, it would be "live action" to them. However, I do like to imagine that a college-age Andy is sitting in a theater nostalgically watching "Lightyear" (and then possibly going on the Internet afterwards to complain about how the movie "ruined his childhood"
).