How not? It doesn't explain it anywhere. Saying "I first heard about Foobar a while back" doesn't imply anything about the reader. The fact that the author doe

How not? It doesn't explain it anywhere. Saying "I first heard about Foobar a while back" doesn't imply anything about the reader. The fact that the author doesn't explain what they do anywhere (except for what you can infer by reading what they say about the product later) does.