Support for SMBv1 is still in unraid. What is not there is the ntlmv1 protocol as it has been removed from Linux. It would have been better if it was left in Linux and disabled as the default so it could be enabled as necessary, but LT has no coltrol over that.
If a legacy device insists on ntlmv1, it won't be able to connect to Unraid, if it doesn't, it should still connect.