"I have no idea, who at ISC wrote this recommendation " - this is the whole point ... this wasn't written by anyone at ISC, but is inferred / synthesized / arrived at by the ChatGPT algorithm.  I did several google searched on strings from the result I was given and couldn't find this anywhere.  So ChatGPT isn't copying content, it is generating it ... albeit incorrectly in this case :)

As we looked into things further on our side, it appears as though the UNIX 'hostname'.  We were able to resolve the issue in UNIX by doing the following to change the hostname to 'mynewhost':

log in as root
hostname mynewhost
echo mynewhost > /etc/hostname

The 2nd line will change the hostname in the current processes, and the 3rd will make sure that the change will persist during a reboot.  

Hope this is helpful to someone else.