If you look at his script the blocking system lets you hide html elements with css, too hide the app store banner all you have to do is inspect element in chrome, find the element id/class and set it to display none.
However, it's invoked by a head/meta element within the document, so it may still be possible (eg, when the document is parsed, this element is invoked, and the filter is invoked - which comes first?)
Unfortunately there's enough random forums that offer me an app when I'm only visiting for a one-off google result, that I can see a genuine use-case for this.
<meta name="apple-itunes-app" content="app-id=XXX, affiliate-data=YYY" />