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The wheel group in sudo is a little different than a regular sudoer as you can add users to a certain wheel group which has only access to that groups projects with hardly, very little or no access to root.
Whereas your user can be listed under sudo & given full aēcess to root.
Per your referenced post, looks like wheel group is historically just for this use.
The wheel group is a legacy from UNIX. When a server had to be maintained at a higher level than the day-to-day system administrator, root rights were often required. The 'wheel' group was used to create a pool of user accounts that were allowed to get that level of access to the server. If you weren't in the 'wheel' group, you were denied access to root.