It is a bit more than miscommunications I am afraid . . after all whatever the sense of the runway they was approaching it was free from obstacles and , seen the length of it, they should have made it whether it was 02 or 20. If as reported by witnesses they went over the terminal , then veered left over C in the other direction , and stalled in a steep turn , for me it is definitively more than miscommunications with ATC.
As to the Hypoxia theory, thanks for the technical explanation on the DH8. it is just that the voice and the speech delivery reminds me of this from my days in the military., where we practiced it in the decompression chamber. it could be intoxication due another source..or the guy could well speak "normally" like this .