The IPAM software is capable of IP address AND DNS Management. If the account that was used to link DNS to SolarWinds was a DA account and it had permissions to remove the zone, from my understanding, it will remove it from the zone if deleted in SolarWinds. I also believe that is why IPAM communicates with the DNS servers with zone transfers rather than just poll the DNS server. I do not believe that this provides any kind of name/IP resolution, just simply to transfer the data to and from like another DC or DNS server. We are looking at managing DNS with our IPAM tool, but you could try to follow this SolarWinds link to setup a DNS poll instead. I have not followed these steps so I am unsure how they work.
Please note, though a network admin, I have never had to handle our DNS since it is tied to our domain controllers, so I am not completely familiar with DNS management options directly.