I disagree. Blue and green have been problematic for ages. Ever since dual lands. Blue was so op someone even recommended banning Island, since other blue would still have other dual lands.
While I don't fully agree with article, I do think things each color could get a way to deal with different threats in their own way.
If you think hyper specific White ramp is encroaching on Green, what about every color having ways to deal with creatures? Doesn't that encroach on Black's territory? Is Magic worse for it? I'd argue not. Also green getting enchantment removal also wasn't end of White's color identity. You just got used to it.
But more importantly, I added City ramp to White, for one simple reason. If there was a color that would want to build a City, it would definitely be White.