The information provided in the STEP file doesn’t specify the version of Creo (i.e. Creo 4.0, Creo 5.0, etc.), just a release date. Looks like it’s telling you this particular release April 13, 2021.
Checking the Creo release schedule, given here:
This seems to imply it was written from Creo Elements 18.104.22.168, Creo Parametric 22.214.171.124, or Creo Parametric 126.96.36.199. STEP files are supposed to be kind of “universal”, so in theory the version of software creating it doesn’t matter, but then again…
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