I read about several of the delays a few days ago, and as someone who isn't waiting for the game because Metroidvanias aren't my thing, I was surprised by the phenomenon that is Silksong.
I would even say that, even if you're not indie, it might not be a good idea to release your game around the same time, not because it will “steal” your audience, but because of word of mouth and publicity. I imagine that throughout that week, all the news, videos, comments, and social media posts will be about Silksong, leaving your game in the shadows.