sog-landscape.com is using Netlify DNS
$ dig sog-landscape.com NS
sog-landscape.com. 4502 IN NS dns1.p06.nsone.net.
sog-landscape.com. 4502 IN NS dns2.p06.nsone.net.
sog-landscape.com. 4502 IN NS dns3.p06.nsone.net.
sog-landscape.com. 4502 IN NS dns4.p06.nsone.net.
and www.sog-landscape.com is served by Netlify
$ curl -I https://www.sog-landscape.com
HTTP/2 301
content-type: text/plain; charset=utf-8
date: Thu, 15 Feb 2024 23:15:17 GMT
location: https://sog-landscape.com/
server: Netlify
strict-transport-security: max-age=31536000
x-nf-request-id: 01HPQGV3KMVMT4Q9W0RCVAGNN9
because it is correctly assigned IP addresses
$ dig www.sog-landscape.com
www.sog-landscape.com. 27 IN A 54.253.236.10
www.sog-landscape.com. 27 IN A 3.24.66.78
However sog-landscape.com is missing any records. You should see NETLIFY records for this and the www subdomain in Netlify DNS see: [Support Guide] What are the NETLIFY and NETLIFYv6 type DNS records? How do I delete these records? If you don’t then you have not correctly configured the domain.
This is not correct.