No doubt a very thin volume….

Perhaps he’s confused Osprey with Squadron/Signal’s “…In action” series. They did do a book on the Firefly.
BTW: Each one has a different author so the quality does vary.
Just because you’re disappointed with one shouldn’t turn you off the series. They are rather fun and (over here anyway) good value for money.

You’re absolutely right – my bad, and I apologise to all concerned