This is marketing statement which is, generally speaking, is not true. The truth is: currently,
Android sound related API supports only the following formats: PCM 8bit, PCM 16 bit, PCM 32 bit float. So, without additional, non-standard, efforts in each and every particular application, bit perfect playback of PCM 24/32 bit integer samples is not possible. Same with DSD.
From this point of view, DX200 has extended Android's API as well, and, unlike R6, there is at least one 3rd party app (Neutron) that is able to bit perfect playback of PCM up to 32/384 and DSD up to DSD512. With a custom firmware, even more apps can do it. Now give me a proof that a 3rd party app can do the same on R6 or anything else
I'd restrict the statement regarding R6 to Redbook (16/44.1) format only, but even then
it depends on the particular app, whether it is able to pass bit perfect stream at all. If there is no such an app for R6, the developer's efforts are useless. We buy devices to listen particular music in particular apps, not to read specs bs, don't we?