I agree, this video is most probably flipped horizontally. As @sarsastrid already mentioned, sigmoid and descending colon are on the left side.
Also, if you look at all other clips with girls that can take long thick dildos deep inside (Hotkinkyjo, Dirtygardengirl, SisWet, Raisa WetsX, just to mention few of them), you will notice that belly bulge is always on the left side.





On the other hand, if girl is fisted elbow deep, than fister can change the position of descending colon once when she pass sigmoid.

So, maybe, but just maybe, this video is not "mirrored".
Nevertheless, even more fascinating is her ability to easily take long double sided dildo deep into her throat!