Gmail puts a warning box at the top of message: "This may be a spoofed message..." Gmail knows it's spoofed so why is it in the inbox instead of spam? Exampl

Gmail puts a warning box at the top of message: "This may be a spoofed message..." Gmail knows it's spoofed so why is it in the inbox instead of spam? Example: https://imgur.com/a/bQbn48V https://imgur.com/a/bQbn48V