That's really interesting! however I'm skeptical of the information in the table in that article. It doesn't describe testing methodology or list any studies where these results were recorded.
That said, I understand that not all the alcohol will cook off and stay out. Some will re-condense and re-enter whatever you're cooking, and any covering or absorbant layers will retain some of the alcohol that has evaporated.
Edit: my bad, the article does mention a source. However the methodology isn't fully described and the source doesn't align with the claims made in the article.