It is less about the content and more about the design. It is hard to skim. Recruiters receive thousands of resumes and need to be able to get the key points at a glance, and I just don't feel this design effectively works toward that goal. Everything's there if you spend the time to read all of it, yes, but a resume's goal is often to get someone to notice it fast - not to convince someone after a long leisurely read.
If someone wants to use keywords as a screening mechanism for resumes, they don't need a human recruiter to do that, and some automated tool is perfectly able to parse keywords. You could over-index your resume on the prospect that there's a human recruiter as the first screening mechanism and that recruiter is going through every resume and skimming for keywords, yet isn't very good at identifying relevant keywords quickly, but it's a relatively meaningless micro-optimization overall. Keep in mind they were able to get multiple internships before with presumably the same resume structure, so it's already proven to work well enough.
It's like the old progressive JPEGs or GIFs where the first few kilobytes were enough to render the whole image at a lower resolution and the rest just filled in the detail.
