Personally I think its at least a tacit admission that they made a mistake in regards to how Superman was utilized, if nothing else. Making Jon the epicenter of things from a promotional pov, giving him Metropolis, giving him the bells and whistles instead of Clark, that's where I think they're finally realizing (why it needed to be realized, I'll never know), that they screwed up. Hence the big news centering around Superman, being home and being top dog. Obviously they're still calling Jon Superman too, they're not budging off that, but the huge changes directionally suggest they on some level realizing the first initiative wasn't working, or at least not working to the level they might have thought.
As far as Taylor, I do think he embellishes. I'm not some CG believer that the book somehow was the worst selling title in the whole line, we know for absolute fact it's not. But from the metrics we are privvy to these days it doesn't look like it was a top ten book either. But after the Diamond exit, I would be remiss to not at least admit that we can't really know for absolute certain down to the exact.