This is their ABSOLUTE greatest. Innuendo was not one of their 20 ABSOLUTE greatest hits. It was only a Greatest Hit in the UK. In the US, Innuendo was not a Greatest Hit, it was not a Classic, and it certainly didn't Rock. And although we didn't have a Greatest Hits Volume 2, it didn't make Greatest Hits III.
Now if this CD was called Queen Absolute Greatest UK, it would surely be on there.