I strongly disagree with this. A lot of supportive Pokemon for Hail teams happen to be problematic for most Sunny Day team members, such as Tentacruel, Mamoswine, or Heatran. I'd also like to point out Abomasnow has useful utility to the team, while Ninetales is often deadweight frailty.
I think he was referring to Abomasnow himself, who very much dislikes coming into any form of Fire Attack in Sun. Hail is currently so rare that it is less of a common threat than the other weathers, but a threat nonetheless.
Does it really help to have a pokemon that can eliminate other weather changers?
Given that if you just take a load of grass types with chlorophyll and some fires, literally the entire sun team can easily be TTar weak, especially if it is one of the new MixTars everyone's running. Hippo is less of an issue given he is not too offensive, but he can be difficult to KO. Toed meanwhile is easy to get rid of given your large amount of grass types, in most cases, just be careful of Ice Beam and Hypnosis. So yeah, it is important to be able to counter them.
I really like the Goruggo idea actually. I'm definitely going to try that out. I've been running a balanced sun team, leaning on the defensive side with SpecsCharizard + CBHihidaruma occasionally coming in and blasting something to death. I've always been annoyed when my stuff gets spun and snatches away OHKOs from Charizard :(
I tested Goruggo - the Anti-lead set with max HP and Atk. It's a pretty amazing spinblocker in Sun actually, given most spinning Starmies will run Tbolt to hit Burungeru rather than Ice Beam. Incidentally, he survived Shanderaa's Shadow Ball with around 8% and proceeded to OHKO with EQ when the lead matchups were as mentioned, which is pretty awesome. Make him Brave, with 13 Spe IVs to underspeed all 31 IV Roobushin and Machamps who may wish to Payback him into oblivion. Of course he can barely stop any leads getting a single move off, but if you're confident of the spin then fire away.
I've run Lead Forretress to spin away hazards my opponent's lead may be setting up, set hazards of his own, and then volt change to ninetales or whoever I need at the time since he is slow. He would have to be my favorite and most effective lead thanks to the new sturdy.
Lead Donphan has worked for me as well, but lacks volt change and doesn't grant me free switches. A better lead I've used would have to be lead deoxys-s. As usual, he is perfect. I run a set with magic coat, dual screens, and taunt/stealth rock. Jolly with just 96 speed outspeeds all common taunt leads allowing me to spend the extra EVs into making him bulky. He's also useless outside of being a lead, but he's still pretty amazing.
I can attest to lead Forry's amazingness. The only issue is all the lead TTars not setting SR and instead running Fire Blast... Anyway with Gyro Ball he has utility against TTar and can hit speed boosting things pretty hard in a pinch as well.