get-command -module only shows aliases with verb-noun naming
If a module exports aliases which don't follow the verb-noun convention (which most don't), they aren't shown with get-command -module <modulename>.
Get-command -module <modulename> -commandType Alias does show them,
Get-command -module <modulename> -all
This is counter-intuitive, because -commandtype should narrow the results, and the description of the -all switch says it's for "revealing" commands hidden by naming collisions.