Sure, in the case of McGregor-Aldo for example. But in the case of McGregor-Cerrone, everybody with half a brain predicted Cowboy to be blown out in the first few minutes. And Cerrone, on his part, did absolutely nothing to prevent that from happening. His whole gameplan should've been to survive the initial onslaught, instead he just walked right into it, face-first.
The UFC gave McGregor a gimme-fight, and you're asking Smith to act like it's a big deal? He has seen a thousand sports events, and he knows enough to know that nothing impressive happened in there. Even if he is not a MMA expert.
What happened is what was supposed to happen, and that's about it. Rogan is a UFC life-long hype man who will sell you the idea that it was a huge feat for McGregor, Smith has actual journalistic credibility on the line.