The idea is the opposite - "nobody" can make money selling software anymore, because software can be cheaply created by an LLM, so you want to start a business that previously would have had to buy software/software engineers in order to support some other product.
However, even if that holds true (which is a big if - right now I wouldn't want to run a business backed by vibe software), and even if there are enough such business ideas to go around, there's going to be quite a lot of turmoil in the meantime.
There's a fallacy here around how software is fungible. WordPress hasn't made web developers obsolete, despite everybody having access to a $5/mo WYSIWYG-and-domains-and-hosting-bundle environment; quite the opposite, in fact.
I'm seeing the parent's point along these lines: "me and all my friends are starting businesses being the middlemen between WordPress and (people who want websites)". It's not that it won't work, it's just a shit business model.
I don't think that's true. SW that works is still expensive to produce. SW that kind of works is super easy to do. The money is in making SW that works. You still need expertise for that.