I see nothing resembling a Struts 1 or Struts 2 signature anywhere in any of the Magnolia artifacts. I'm not sure what made you think it used Struts, and downloading their CE it was a simple matter of looking at the deployed jars to see that it didn't.
I also checked a couple of the Magnolia libraries to see if there were shaded versions and I saw nothing of note. While I didn't spend much time on this (~five minutes) there's nothing obviously Struts-ish.