You've found a ghost sentence. This sentence has been removed from the course and replaced with one that ends with a question mark, but obviously this sentence is still appearing. Duo is aware of this problem and hopefully they'll fix it eventually, but there's really nothing we can do about it. Sorry.
I thought the lack of a question mark meant that the position of the verb incontestably indicated that it was interrogative. (Would that be correct?) Of course, if the sentence was spoken there would be intonation and body language and context to help us know where it was a statement or a question.
Well, actually... In English you can make a question of a statement by using a rising intonation, but in the opposite scenario - if you put in place the necessary grammar for a question - it is rare that you could make a statement of it (e.g. the use of do, or modal verb/subject word order). The only exception I can think of would be rhetorical questions such as, "Is it really that important?" which would be spoken with a falling intonation so to mean, "it is not really that important."
There is a ticketing system now? Wow, awesome. In my day we had to use the chat (@Myra) and had no trace of how long an issue was open or what even was an issue andwhich parts they simply ignored. It was mostly a very frustrating experience for everybody involved, but had the advantage that we could contact devs directly and remind them of an issue...
That's what it was like when I started out, but they've done a lot to straighten things up lately. We weren't the best at kicking their shins in the first place, so hopefully this will help us. (I actually added this as a bug from us, but had it removed as a duplicate). And today we got the special letters!