Yes, this is typical AI weenie optimism. "We can handle many of the easiest cases, so in X years we will be able to do all the really hard things that we haven't even thought of yet!" No.
You could have made you point in a far better way that encourages and doesn’t berate. Eg often people are optimistic but are unaware of the hard edge cases, the edge cases are interesting
i dunno, we could equally say that your position is UI optimism. AI is new tech, certainly as it now becomes feasible to apply it to real problems. Given some of the challenges AI is solving right now this one is relatively trivial, HTML and CSS have specifications and there are well held paradigms and principals of User Interface design. The domain is very constrained so lends itself to AI very well. To say this is an exercise undertaken by the author and the very visible progress he has made is very impressive. If you read the entire article the work he does on recreating designs is even more so. Surely one of the goals of 'intelligence' artificial or otherwise, is to actually deal with "hard things that we haven't thought of yet" AI is solving (and unearthing) those problems right now. Imagine somewhere like squarespace where all you do is upload a design and website is produced as a result is that beyond the realms of possibility given this really impressive experiment produced by the author, definitely not. Id hate to think we had to contrive edge cases or fabricate complexity just so we can prove that AI cant sole every problem...