[sangnoir]

> Nonetheless, a form of speech known to linguists as General American is perceived by many Americans to be "accent-less"

TLDR: "neutral English" is like "neutral water temperature" - it feels neither hot not cold because it matches ones body temperature. It's subjective, and terming it "temperatureless water" is even less accurate.

I'd put emphasis on "perceived" and "American" in that statement, and also note that this is limited to regional accents: General American is unambiguously American. Similar to General American, many countries have developed a "Newscaster" accent, e.g. Received Pronunciation for Britain, but it's not considered neutral as it is the "upper class" accent.

In every language I've known well enough to distinguish accents, I've realized newscasters adopt a distinct accent/cadence that's not commonly used. But I wouldn't call it "accentless" - it's just another accent that may/may not have evolved from a culturally dominant regional accent (or dominant figure from a specific region.)