Developer evangelism is marketing, not development. To view this through any other lens seems silly. You wouldn't think badly of a marketing agency that was effectively able to promote two competing companies -- they're just doing their job well.
Even marketing - vapid crapola though it often may be - has to try a little bit and maintain at least a superficial veneer of sincerity and substance in order to work.
"Developer evangelism is marketing, not development. "
I agree. I am just surprised such "marketing" is successful in influencing developers. Maybe I have an (erroneous) image of developers as essentially rational people who are somewhat immune to such empty "buzz" as Mr Dodge seems to put out.