You'd have to ask a native speaker. To me, it's unclear and I'd be reluctant to make any definitive statement.
Remember that Russian intonation is different from English (and most likely other languages too), so the inflection you hear one way, a Russian native speaker might perceive differently. Just because it doesn't sound like a question to you doesn't necessarily mean it isn't one and vice versa. Which is not to say this audio is perfectly right or wrong, I'd just warn against assuming that because you perceive it as a question it must be wrong!
I'm very out of practice and I never had a perfect handle on intonation anyway. What you need is a native speaker. Sorry!
The intonation here (and not only here, it's the problem of the whole cousre) is wrong and unclear. There are three sullables here and for me their tone changes like
" _ _ - "
But for a clear question it should be
" _ - _ "
And for the statement
" - - _ "
Also, there is a type of question when you not really asking but doubting the received information (like "He is a boy! Are you kidding?") In this case the intonation of "он мальчик" is
" _ - / "
You'll find another useful/helpful thread on this discussion at "Я здесь."
The thread primarily discusses the мягкий знак (the "soft sign" or "ь"), but I found a web page (TOPIC: The hard sign" (ъ)) that provides some interesting information on both:
soft sign -- мягкий знак (ь)
hard sign -- твердый знак (ъ).
I went to Forvo to see if I could hear the difference between two words that were similar, but one with the "ъ" and one without. I chose въезд (entry) and везде (everywhere). I don't know how good these audio recordings are (although one of them is by someone named Shady_arc!), but I have to be honest. I really didn't hear much of a difference between them. If you'd like to hear them for yourself, the links to these audio recordings are below:
Whether you hear a difference or not, I do recommend the video links Shady_arc provided -- "Palatalized Consonant" and the other (click on "two videos"). They are both really quite good. The second one (whose YouTube title is "More on Soft and Hard Signs in Russian") actually enhances your understanding by providing wave forms of pronunciations with the "ь" or "ъ" and without. Very helpful.
Hope you find that interesting and/or useful.