No, haters still cling to the idea. Does not make them correct though.
The Switch was made for adults first, as the ads show. It has IPs like DOOM, Octopath Traveler, Wolfenstein, LA Noir, Skyrim, Disgaea, Xenoblade, Outlast 1 and 2, Diablo, etc on it now. None of these are geared toward kids.
They continued investing in Bayonetta and brought back Prime. Even games with artistic styled graphics such as BotW are catered to adults gameplay wise, as kids get lost in such deep open worlds. Games like Splatoon 2 appeal to both, and are neither kiddy nor adult.
So no, the Switch is not made for kids, nor does it look like it is. However this is the internet and haters will cling to whatever they can to downplay, especially when what they are hating on is successful. False as it may be, the idea will never die.