[Samba] outdated entries in DNS?

[Joachim Lindenberg]

Following Jonathon´s suggestion in https://lists.samba.org/archive/samba/2019-July/224347.html
>You may find this method easier for locating the PDC emulator:
>     host -t SRV _ldap._tcp.pdc._msdcs.<domain>
I got two results, the current PDC and a non-existent historic one. I also checked other entries in *._msdcs.<domain> and there are other obsolete entries. I read that this was a bug in older versions of Samba that DNS was not cleaned up and I assume I can safely delete these (preferably using RSAT DNS tool) ?
Thanks, Joachim