This reminds me of the "webmaster" days when the debate was over whether doing HTML could be considered "programming". My position then as now is that being a programmer (developer in this context) requires programming a programming language, and neither HTML or Wix is that.
On the other hand, in practice, in the presence of a technology that non-programmers can use to build perfectly viable products, the onus is probably more on the "programming-language-programmers" to differentiate themselves and seek out the challenges that can't be solved by "HTML-programmers". If you as a programmer find yourself in a venue head to head with a Wix'er, you may win a small victory in the battle over definitions, but you will lose the war. If the problem can be solved with HTML/Wix, in most cases it should solved with them.
On the other hand, in practice, in the presence of a technology that non-programmers can use to build perfectly viable products, the onus is probably more on the "programming-language-programmers" to differentiate themselves and seek out the challenges that can't be solved by "HTML-programmers". If you as a programmer find yourself in a venue head to head with a Wix'er, you may win a small victory in the battle over definitions, but you will lose the war. If the problem can be solved with HTML/Wix, in most cases it should solved with them.