Even the YNP page makes no sense. What restrictions?
Trails and Wilderness
Trails in Yosemite may be closed when there are hidden hazards or when they are impassable due to rock fall, snow, ice, or fire. Open trails aren't necessarily free of hazards--by entering the wilderness, you assume responsibility for your safety and must use good judgment. Trails not listed below are open, but may be snowy and very difficult to find from about November through May/June (and may have other hazards).
Trails in the northwestern part of the park, including the Hetch Hetchy and White Wolf areas, are closed due to the Rim Fire.
The Half Dome cables are up through October 14. A permit is required to hike to the top of Half Dome when the cables are up.
No smoking and no building, maintaining, attending, or using a fire, campfire, or cooking fire (including charcoal fires) within Yosemite Wilderness or at the High Sierra Camps.
Portable stoves using gas or pressurized liquid fuel are allowed. Alcohol and "Sierra" stoves may not be used in wilderness under these restrictions.
(This does not affect picnic areas and frontcountry campgrounds.)