Definitely cautious about this "leak", a lot of these combos seem too good to be true, and I honestly don't believe the Cherries Dual Squelcher, for one it would be Cherry, not Cherries (since that sounds and looks better), and two, these weapon variants are supposed to be bright, vibrant and clearly a different colour from the original variants, and this would be another red Dual. Also, like people have already mentioned, where are the Splatling? Why is there only one Slosher?
It was said in the Direct that Sheldon's Picks would be a combination of the popular "favourite" weapons and the underused ones. Most of these listed ones aren't really underused, I think of weapons like the Sloshing Machine, H-3 (is listed here admittedly), Jet Squelcher, Hydra Splatling, Mini Splatling (not the Zink) etc. Hardly any of the weapons here fall into that category, so I am very dubious. Also, the Splash Wall Charger won't be nearly as OP as you think, since it takes a lot of ink to generate and since they were nerfed, will be destroyed quickly, leaving said charger very vulnerable to attack. I also doubt that the devs put the variants in the 2.6.0 update after the fiasco last year where all the weapons and maps were leaked not long after the launch. Speaking of which, the Sloshing Machine Neo was going to have the Sprinkler and Inkzooka when it was still just a codename rather than a fully finished weapon, so even if this is legit it doesn't mean they'll stay with these sub/special sets. Not long now until the 1st set release so we'll find out soon enough. I'll be waiting on Triggerfish rather than Saltspray despite the pun since Saltspray sucks. If this is real, I'll most likely jump into Triggerfish's water because Nintendo can't keep information off the game until they're ready to release it :p
Edit: Just came across a post on Reddit that pointed out that the Sploosh is not actually correct. It's called the Tomato Neo Sploosh-o-Matic, which is incorrect, definitely throws this into a whole new perspective, since that weapon would have to be called Tomato Sploosh-o-Matic for this information to be correct.