Yes, https is default and recommended. That note is only suggesting that for whatever reason if you want to use http, then it must be enabled on the cluster (as http is disabled by default). Probably, the way that sentence is placed may have confused you.
Exactly, that statement in article is confusing. So, https is required to enabled if already not enable that would be helping to get work ansible module. Please confirm if any other way to get work ansible module for NetApp cluster or only https would be helpful. Thanks.