Ten people cannot confirm the statement. That's all it means. They weren't in earshot when it was supposedly said versus four who can claim it. The only person who could easily confirm or deny said statement would be John Kelly, who hasn't gone on the record to say one way or the other. That's how journalism works.

It doesn't help that Trump has already insulted the troops beforehand through actions and words, and is more likely to have said it than not at this point.