Wealthy?
"People owning the 20 per cent of devices running Lollipop or later are probably wealthier than others, and therefore more attractive targets."
Not entirely sure how any of the miscreants would deduce I'm wealthy, just because I have a $120 MotoG, that got upgraded to 5.1 a week or so ago.
Leaving this aside, CVE-2015-3876, and CVE-2015-6602 are not checked for in the stagefright detector app (thanks for the link). Are different bug reports assigned to the new threat?