I haven't kept up on the details of Bloc's themes, but I'm wondering if his impulse theme was even made with mobile in mind? Regardless, I think google is only looking for this tag to be in the <head> of the theme.
<meta name="viewport" content="width=device-width, initial-scale=1">
Put that somewhere before the </head> tag in the index.template.php file. See if that helps.