This is just FUD. Storing the cookie consent in a cookie is obviously "strictly necessary" if that's all you do with the cookie. Strictly necessary cookies do not, themselves, require consent.
You're saying that without obtaining consent, you can't store the cookie consent preference which is a ridiculous catch 22 explicitly rejected by the first link you shared (which states that the consent choice must be stored)
You're saying that without obtaining consent, you can't store the cookie consent preference which is a ridiculous catch 22 explicitly rejected by the first link you shared (which states that the consent choice must be stored)