Architectural improvements probably wasn't the best words to use there. I was referring to this paragraph of the article:

Originally Posted by Digital Foundry

With some PS4 Pro titles, we've been vocal in our criticisms of game modes locked to specific display types. If a title has a high resolution mode, 1080p display users should get super-sampling - something that doesn't always happen, even on Sony first party games. Part of Microsoft's commitment to the 1080p user is that super-sampling is mandated - if a Scorpio title runs at a higher resolution, it must downsample for full HD screens. Similarly, in-game frame-rates must be the same or faster than standard Xbox One titles. Hopefully we'll actually see smoother performance.

At the hardware level, Microsoft is confident in the quality of the scaler built into Scorpio's display processor. It's enhanced over the Xbox One S equivalent to "handle the bandwidth and quality requirements of 4K", using a high quality six-tap vertical and horizontal Lanczos filter. Compared to a native 1080p output on Xbox One, super-sampling is a great feature to have: anti-aliasing quality is second to none, the same texture filtering quality improves with more resolution (for a given screen area, the texture is sampled more) and art is richer owing to the use of more highly detailed texture assets.

Microsoft's insistence on 1080p supersampling is actually more inclusive than it sounds, and it's good news for users of all screens. There have been instances of PS4 Pro games with higher performance 1080p modes only accessible if the front-end is set to a full HD output - No Man's Sky and The Last Guardian are two examples of this. If your Pro's set to 4K instead, you might never even know that an alternative, higher performing mode exists. With Scorpio, all game modes - resolution, performance or otherwise - must be available to all users regardless of the display the console is attached to. This philosophy reflects a long-held Digital Foundry view, and hopefully PS4 Pro titles will also follow suit.

Gaf

It's Microsoft. Loss-leading is their original mantra.

In sheer specs, yes, but thanks to console specific optimizations and the architectural improvements MS has made, Digital Foundry believes it will perform closer to a 1070 or Fury:

"From what I've seen so far, there is some evidence that Scorpio's true 4K performance could pose a challenge to the likes of Nvidia's GTX 1070 and AMD's Fury X-class hardware."

They tested Forza 6 Apex on PC (which is basically the same as the Scorpio tech demo they were shown) and found that it took a 1070 to hit 4K 60 FPS ultra settings on it like they were shown on Scorpio.

Architectural improvements probably wasn't the best words to use there. I was referring to this paragraph of the article:

The bottom line is that Scorpio's six teraflops will almost certainly go a lot further than an equivalent PC part. I asked Microsoft about this specifically, and they raise a number of good arguments that make the case strongly. Firstly, that their shader compiler is far more efficient than PC equivalents (think of shaders as native GPU code). Secondly, addressing the hardware directly via their API and with access to console-specific GPU extensions again adds to the advantage of a fixed platform box. And finally, they point to their optimisation software - PIX (Performance Investigator for Xbox) - as a tool that provides the path to console-specific optimisations that PC simply cannot get.