No, I don't question their claims, but their product specs aren't listed very consistently so it's hard to tell what actually has what.
Some things have certain features listed while others things obviously have those features but they aren't listed. For example, the redundant transmission feature- not all the receivers that do it have it listed as a feature. THey have two things- different polarity antennas (they call it MultLink) and dual-channel redundant transmission (DualLink). It is almost implied by the advertising that each channel has more than one receiving antenna arranged in different orientations to cover multiple polarities. Though this seems to be true for the most part, some receivers seem to only have enough antennas to receive one frequency at one polarity- so that if the first channel is being jammed, but the second channel is out of view because it is at the wrong orientation, you just lost connection with your plane.
That means in certain orientations during flight, you are effectively flying without a redundant backup channel.