IME the photos on that review page he posted for that kit lens are not actually indicative of the quality of that lens.
If you take his argument a few steps further, you shouldn't buy a DSLR with a crop sensor, because you aren't getting the highest quality, and then you shouldn't buy a DSLR that is full frame because medium format is better, and so on... Quality (vs price vs convenience) is a range and crop-sensor DSLRs with modern kit lenses do have a very solid spot on that range.
In any case, most people probably shouldn't buy DSLRs but not because they will only use the kit lens but because DSLRs aren't pocketable and most people just aren't going to lug around a non-pocketable camera, even if they think they are (this applies even to the newer small mirrorless interchangeable lens cameras which are certainly smaller than DSLRs but still a bit too big to be pocketable in most situations).