The thread is titled "Post Rotation, Special energys are death?", so I guess clickbait works!
Trying to run your entire deck on four Double Colorless Energy is super risky, just like it was before Puzzle of Time and Special Charge. Even that isn't "death", as some decks might pull it off. Most decks will just include some other Energy, using DCE for speed boosts.
Decks just including Special Energy is perfectly safe. XP