I don't think many people would say an LLM written in Python is conscious BUT an LLM written in Excel is not.
People just don't ascribe consciousness to things that can't converse (or at least emote or give the appearance of emoting), and spreadsheets don't do that.
The reason people are debating the consciousness of LLMs is - obviously - that the LLMs generate sufficiently plausible text that people using them think they're having a two-part conversation. Like I think I might be having a two-part conversation now. Turning your question around, why do you think Hacker News posters are conscious? You have no direct evidence they are.
To be clear: I'm not talking about surface level things like prose. I'm saying that no matter what you do - whether you just paste a truncated log of a command into it with no further comment, or talk like a drunk teenager with no appreciation for grammar, or mix natural languages, or mix natural languages and JSON, or whatever else, the reaction you get is always that you would expect of a helpful person that got your message. It'll try - and usually succeed - to parse out what you actually meant, and deal well with subtleties around it.
This alone may not be enough to call it conscious or intelligent, but at the very least it's a large leap in that direction, and a qualitatively new functionality that classical software does not posses.
--
[0] - This is by design, not accident. "Respond to arbitrary input in a way that makes sense to humans" is literally the overall goal function the LLMs are trained to.