Why people say this is another Thriller Bark? Just because we being introduced to weird things? If that is the case, people are doing a huge generalization! And complaining about their bad rationale.
About the liquid thing, my bad. What I was basing of was the SBS Oda made in volume 41, chapter 398. Basically he says that any standing water: Rivers, Pools, Baths, … Is included in "Sea" and the devil fruit users are weak to that.
Here the quote:
"The "sea" here can refer to anything from rivers, pools and baths to any kind of standing water. On a worldwide level, they are all the "sea." When these people enter the water, not only can they not use their powers, they have trouble moving their bodies at all."
Because any significant amount of standing liquid, is majorly contains high quantities of water, and even if not they are still considered in a "worldwide level" as "sea". I took as being submerged into a standing liquid would weaken a devil fruit user. Still as many people here said, Juice and any "sea" in Big Mom territory is manly composed of water and so is included in the equation.
I ask, what kind of liquid significant quantity of standing liquid exist, or appeared in OP, that doesn't contain water?