It's okay to use specific examples to explain a general principle or to make your point more clearly. But when those examples are more-or-less made up, as they

It's okay to use specific examples to explain a general principle or to make your point more clearly. But when those examples are more-or-less made up, as they are here, you'd better: 1. Be clear that they're examples and not some fundamental, mathematical truth. 2. Use multiple examples with different numbers to show how things could look different, even if only slightly. The author does neither of these. #1 is violated in the title. It's not clear at all that the author is using these numbers as merely examples.