The Cross Roads Recovery Centre is a Alcohol and drug rehabilitation center. Perhaps he was scamming people to get money for drugs. Their phone number is +27 12 345 1186. Maybe someone wants to check if he is actually there, although I don't think they would be allowed to tell you.
So wouldn't a better use of the mask be to wear it all the time, and only take it off when you ARE training? This way you adapt to having less air, but get more when you need it during training.
I believe one team did Sani2C on cross bikes about 3 years ago. I also saw someone riding a cross bike on the TV footage of the Eston MTB race this year.