Ok. Gotcha.
FWIW, I did not make this list.
I simply copy/pasted it from the article.
Looks like the Author probably abandoned the 'strict chronology' after Phase 2... and Phase 3 is just listed in order, by release date.
Btw, not sure if you read the article, from the link... but the Author says at the beginning:
"For newcomers to superhero movies — perhaps those who have become absorbed in the Marvel Cinematic Universe (MCU) following
Black Panther — the amount of watching material can be overwhelming. But for those wanting to persevere, there are TWO watching orders.
(1) Really, you should probably watch these movies in release order, starting the journey starting with Iron Man — one of the best MCU instalments to date — moving onto
The Incredible Hulk, then
Iron Man 2, Thor, Captain America: The First Avenger,finishing Phase One with
Avengers.
This order works well with post-credit scenes all setting up the next movie and has the intended rhythm formed by producer Kevin Feige.
(2) However, many fans have taken to watching the series in chronological order.
(the article continues...)
Phase Three marks some of the best MCU movies so far, but also some timeline bending difficulties. For instance, Doctor Strange begins before Civil War, but finishes after Civil War.... Also, Black Panther and Spider-Man both take place directly after Civil War, while Ragnarok and Panther directly lead up the upcoming Avengers: Infinity War.
Below’s just a guide for a manageable way of watching based mainly on release order.
(Then the Phase 3 movies are listed after the sentence above)