There's a 5th edition out for it, and Chaos Daemons is the defacto source of Chaos Daemons, and the nature thereof along with the Liber Chaotica.
There isn't anything in the Codex: Chaos 6th edition that specifically out dates, or changes anything about the Chaos Gods being powered by emotions because that's their core concept.
Slannesh was born of the Hedonism of the Fall of the Eldar.
Khorne was born of the hatred, and bloodshed caused by the Crusades in Terra's middle ages.
Nurgle was born from life's fear of death, likely caused by The Nightbringer, and is the first born.
And Tzeentch was born at an undescribed period, but it is assumed he was spawned similarly.
To have this be rectonned would remove The Fall of the Eldar ENTIRELY, and would require the Eye of Terror not to exist.