You're basing your interpretation on your relationship with his blog and listening to his podcast. I'm basing my interpretation on what he actually said. Other posters here commented that they thought "rather significant system-wide UI overhaul" would mean exactly that not as some euphemism for "I dunno, we'll see how it works". Perhaps he'll change tune on his podcast (I don't listen to that so wouldn't know).
No, you're definitely not basing it simply on what is said, if your first reaction was to link it to his "usual hyperbolic shit," his past discussions on UI, and then later reference his past discussions over UI chrome and fonts.
No posters have said that they thought "apparently rather significant system-wide UI overhaul" means he is creaming his pants.