I think you're right. Even Ayer's painfully naive version of positivism would not have said Eliezer's sun cake sentence was meaningless; certainly that's not what you'd get from the views of Carnap or Neurath. But perhaps Eliezer was more interested in talking about Ayer's fanboys than about the major logical positivist philosophers, and there certainly are people who discover Ayer's verification principle (or Popper's falsification principle) and immediately develop an extreme overconfidence in its ability to simply dissolve all manner of problems.