Don’t spread outdated information.
The only thing this does is intimidate people from using cast iron at all and that’s just a shame.
Yeah, I think this was my biggest issue when I started using cast iron. I never had much luck getting it actually clean without soap and it definitely showed in my cooking. I eventually got some better advice and started having much better results. Now my CI is my go to eggs every weekend and afterwards, I throw it in the dishpan with everything else. As long as you don’t soak it, you’re fine. I think the soaking thing is a big part of why a lot of manufacturers still recommend against soap and water. It’s easier to tell people to not use soap and water than it is to explain the nuance of “wet it, don’t soak it” and “gently wash, don’t scrub into oblivion”.