it feels like soon anything that chatgpt doesn't know will be deemed "misinformation"

any experts in any field can easily find tons of stuff LLMs don’t know.

hell they don’t even know how to measure or calculate wallpaper correctly.

Nobody can. Wallpaper calculations are in the realm of eldritch mathematics.

You always end up with a gap, and despite that several rolls left over! Which you will then keep for years "just in case".