How Apple Handles App Store Infringement Complaints: Badly
osnews.com
osnews.com
DMCA: recipient pretty much must act under the assumption it's legitimate, legal action can be taken against someone who files one fraudulently.
This case: Apple is free to apply common sense, but no guarantee they will, and no legal action is really possible against "someone sends something making vague claims of proprietary technology".
It doesn't use any magic phrases that have meaning, like "patent pending", and it doesn't claim to be a DMCA takedown, so if Apple decides to yank an app, that's between Apple and the developer they screwed over.