Technically, it's not a violation. They're releasing code; just not the code. So long as they (offer to, and then actually) provide the source code on request,

Technically, it's not a violation. They're releasing code; just not the code. So long as they (offer to, and then actually) provide the source code on request, licensed under GPLv2, they're allowed to do that. Though it probably is a violation, because they probably don't do that.