Once you get the code in a single .html page, you can choose to un minify it, but what is more likely is that the ad provider would like to see things like the 'clickTag' function at the top of the page in a human-readable format. Having the JS code minified will speed up ad loads, but you can unminify it by following this: I Need The Non-Minified Version Of The Code - #6 by jonathan (but it may not be what you're looking for)
Is this an SVG you dragged into Hype? I'm seeing that vector shapes do not define classes if they are created in Hype. If you have an external SVG, you may be able to inline the CSS styles by using SVGOMG - SVGO's Missing GUI
To quickly add this yourself, you can edit the <head> of your Hype document manually. You can edit the contents of the <head>…</head> of your exported .html file by clicking on 'Edit HTML Head' in the Document Inspector. (Make sure you use " quotes and not smart quotes like ”)
In the image above, click on the individual ‘layouts’ and make sure that you have Sizmek selected as the export script. Currently you have an un-exported slice (scene) selected.