If you want text, kingbdogz on Twitter, the dev who is pretty much in charge and responsible for sculk and the deep dark and the warden, has talked about the sculk various times

But at least from one video about the sculk, the deep dark biome literally comes from the void (so it generates as low as possible in the world) and catalysts are the stomachs of the sculk

(Link to the video I believe is being referenced)

First of all, holy SHIT you should not have told me about this because there's SO MUCH- sculk's visuals being inspired by opals?! are you KIDDING me sculk RULES

Second of all- I Was Right About Everything The Whole Time And None Of You TOLD ME

To be pedantic (because I think it holds huge importance to the lore of it), the deep dark biome itself was described as having an anchor point below bedrock- which doesn't necessarily mean it's *from* the void, just that its intended to be as close to it as possible. Whether or not it comes FROM the void massively affects its intended purpose

GOD it's awesome hearing sculk being confirmed as a living thing though, And further confirmation of the souls-exp correlation. However, the specifics of how its described makes me question whether it was 'created' by the civilization it ultimately destroyed. Language barriers are a factor here, but the fact that its described as 'having found itself' underground makes me think its an organism taken from elsewhere. This WOULD still require external interference, and likely major editing, as we don't see any mirrors of it elsewhere, so it's definitely still at least partially artificial.

The Warden being described as a defense system For the sculk is also interesting- continuing to presume the sculk was created/edited for defense against the End/Void, this would imply the sculk Itself is the defense, instead of merely being the infrastructure required to support and transport the Warden as I'd previously assumed. If we assume it was edited rather than created, though, its very possible that my original thoughts were correct, with the Warden being the intended defense, and the sculk simply being brought along as the necessary precondition for using him.

I do also want to quickly note that electricity is a major factor in real-life living things, so the sculk interfacing with redstone isn't Too wild, but the fact that it gives out a strong enough signal to register on devices not specifically designed for that is notable. No other living thing in minecraft can trigger redstone without an additional connecting layer (like an observer) as far as i know! And it's obviously something that was being studied, if not actively used. The main question there is if it naturally had that trait, or it was amplified or introduced artificially

SCULK!!!!!!