As you become more experienced in these things, you won't be fooled by something like this.
In the good ole days, the audio portion of the film used to be kept in the AUDIO_TS folder of the DVD. It was, however, soon discovered that the audio and video portions of the film could be multiplexed together, which they've been doing ever since, which leaves the AUDIO_TS folder empty. It is included in all DVDs to maintain backwards compatibility with earlier versions and older players still functioning in the marketplace.
The lack of a checkmark doesn't mean you're not getting the audio - it simply means the Audio folder is empty. Try a rip and you'll see.