I’ll be adding the spoiler feature again for Let’s Go questions closer to its release, though if you think it should be added sooner I can do that.
But I don’t consider information announced publicly a spoiler, there have been several trailers with Meltan already. It’s pretty much impossible these days to avoid these kind of ‘spoilers’ unless you completely cut yourself off from all social media and Pokemon websites.
As for my comment above I think judging by the other question you’re talking about the link to Meltan appearing in the “related pages” thing. I may be able to remove the page from there, will need to check into it.