It's all propaganda, mate.
Yeah, you should take it out. The MDMA won't have degraded (at least not significantly), but you should get it out of the moist capsule if you can. MDMA is water soluble, so it will slowly dissolve if you keep it in a moist container. Do you have one of those silica-bags they always stuff in shoes to absorb moisture? You should add one of those to your bag of capsules ASAP. I suggest you dump the moist capsule in a pile of ordinary salt to absorb most of the water. Then afterwards, carefully open it and wrap the contents in a piece of cigarette paper (or a fresh empty capsule if you have 'em). This package should then be designated your first roll, or you could pass it out at a random rave in an effort to make new friends.