Are the new gang hideouts added in "The Liars and Cheats" DLC multiplayer-only?

The Liars and Cheats DLC (Rockstar page) adds seven gang hideouts to the game. When visiting Crooked Toes — an area with a distinct rock formation — both at night and during daytime there was no activity in the region. Do the hideouts only appear in the online multiplayer?
I have the Game of the Year edition (includes all DLC) on Xbox 360.
Best Answer
The Hideouts added by The Liars and Cheats DLC are only available in Free Roam (multiplayer).
As the wiki states:
The Liars and Cheats DLC adds seven hideouts to Free Roam that are not available with the base game. Upon completion of any of the gang hideouts added by this DLC, an Explosive Rifle is awarded to the top player.
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How do you get gang hideouts to spawn?
Red Dead RedemptionComplete Twin Rocks, Pike's Basin and Gaptooth Breach hideouts in singleplayer. Complete Tumbleweed and Tesoro Azul hideouts in singleplayer. Complete Fort Mercer and Nosalida hideouts in singleplayer. Complete all hideouts in a single public Free Roam session.How do you unlock the gang hideout in Red Dead Redemption?
All gang hideouts respawn. It takes about an in game week, or if you leave one alive, run away until the red blip disappears, then come back in a few minutes, they will all be there again.Do gang hideouts Respawn?
These gang hideouts are semi-random clusters of enemies with rewards given for beating them, as well as the chance to alter your morality along the way. We've listed all 17 Red Dead Online gang hideouts locations below, including what you can do when you find them.Let's Play Red Dead Redemption (Bonus) Legends and Killers, and Liars and Cheats DLC
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