The sexy science owl is awarded if the text is interesting for readers which have absolutely no background in the topic of the post. In this post there are many technical terms and some technical pictures (the wiki figure,figure 4 etc). These technical parts only have meaning if you already have some background. I think you can reduce the information of these technical parts to a simple idea which is accessible for everybody. For example I think the only thing you need from the DMPC section is the introduction of hydrophobic and hydrophilic.
It should be noted that writing a popular scientific article is much harder if the content is very technical. So the difficulty of getting the sexy science owl is very much dependent on topic.