Just to clarify, this disk comes with PCM 5.1 - this is uncompressed 5.1 audio i.e. what DTS Tru-HD becomes when it is 'unzipped' by your Blu-Ray player or amp. DTS Tru-HD is just a lossless compression format for fitting the uncompressed 5.1 audio into a smaller space. There is zero difference in sound quality.
It doesn't excuse the listing of DTS Tru-HD on the cover (not sure why they would do this) but you get the same 5.1 high quality soundtrack - they just don't 'zip' it!