I don't see when this article was published but it seems outdated. The team is using MEAP[1] which links to a wiki page listing technologies including YUI that are no longer maintened and was built on MonoCross[2] which doesn't appear to be maintained either. This was obviously a large endeavor to take on so I wonder how the team is dealing with this.

[1] https://en.wikipedia.org/wiki/Mobile_enterprise_application_...

[2] http://monocross.net/