Hi , sorry, still not supported :)
https://social.technet.microsoft.com/Forums/en-US/291f0688-6eb2-435a-84fa-0fd0514af5f4/i-renamed-my-exchange-server-now-nothing-works?forum=exchangesvradmin
https://social.technet.microsoft.com/Forums/en-US/bdf47a63-fa02-4748-aab3-a254ed975470/is-it-possible-to-rename-an-exchange-server-2016?forum=Exch2016SD
https://www.itprotoday.com/email-and-calendaring/basic-impossibility-renaming-exchange-server