I really agree with that chart, frankly! (Not as much as my list, but I'm biased by my own methods.) It's picking out more-recent anime that you can find on streaming, and that you are more likely to have a conversation with in the broader anime community (which has a median age of somewhere in the twenties, iirc.)
It's easier to get people invested with material that's current and benefits from more modern animation improvements, speaking from personal experience with gradually easing people into anime.
There are some timeless classics, but shonen trash (which I love) is one of those things that if you're not watching it as or around the time that it airs, it tends to age poorly.
Recommending older material to a new fan to go watch Legend of the Galactic Heroes, Robotech, or Yu Yu Hakusho is like telling a movie fan to start with Casablanca and Hitchcock Movies. It raises the barriers for entry considerably. (It's why the 'Classics' list in the OP is so truncated.)
...now, that's not to say you can't say to someone who's really loving newer material that hey, there's this classic you'll probably love, but I've found it's more successful to hook folks on the shiny new stuff first.