Yes, we found that out as well with Microsoft support last week. I didn't go back and update the parameter definitions. Glad you now have it documented out there now!
Other useful tidbits that we found out:
When changing some of these parameters we had to "Set domain to managed to clear all federation setup"
Set-MsolDomainAuthentication -DomainName EXAMPLE.com -Authentication Managed
Also you can't have more than one Federated domain name without some additional setup (support multiple domains). We were getting cryptic errors when migrating our production domain but leaving the 'test' Federated domain in place. We fixed that by setting the test domain back to managed and left it that way.
When the need arises, we'll have to back an figure out the syntax for supporting multiple domains. MS support also informed us we may have to set all the domains back to managed prior to attempting to support multiple domains on the tenant. "Future problem" for future self ;)