Honestly (and I say this as a fan of Ice types, and a long standing supporter of making the type less awful weakness/resistance wise), I don't think it's an intentional thing. We haven't had any Ground types introduced yet, are they being purposefully hidden away too? And I suppose Bug types round out the trio of GF's most hated types? We've not had any of them introduced for this gen, which is the most unusual out of all of them imo, since the earlygame bugs tend to get revealed fairly early on.
The one Ice type in gen 7 - I think you kind of have a point, but it might be worth keeping in mind we did get Alolan Vulpix/Sandshrew (they're not technically new Pokemon, but it was the first time we'd ever had both of those families as their Ice type variants).
I feel like this is the most secretive they've been about a new generation for a while (I have my suspicions that after they revealed what felt like 90% of new Pokemon prior to Sun/Moon's release they wanted to dial it back and keep a lot of new Pokemon to discover in game). It's got nothing to do with them having a vendetta against Ice types. I mean we know next to nothing about Zacian and Zamazenta - usually we'd get the mascots types, abilities, signature moves, lore etc, this time we've only been told their names.
Even in the Galar region map, there's a whole section that looks like a snowy mountain range - even with what could be a gym (which is presumably Ice type) there as well. I'd be surprised if there were no new Ice types there.
I think it's a pretty big assumption to say that they hate Ice types and are actively trying to hide it when we don't even know the full dex - there could be several new Ice type families that they're saving for people to find out about themselves in the game. If the game gets released and there are a very small number of new Ice types then maybe you'd have a point, but at the moment there's just not really anything to properly back the claim up.
