It does work. You just need to read the thread correctly.
the replaced domain must have the exact same length as the old one.
Example: my standard i.p is "fortissimum.net" It's 15 characters long including the dot.
So if i replace -> "login01.tibia.com" with "fortissimum.net" IT WILL NOT WORK. Because the length is not the same. Fortissimum.net (15) and login01.tibia.com (17)
Solution:
create a subdomain like "s.fortissimum.net" Now it's 17 same lenght as "login01.tibia.com" it will work
same for "tibia01.cipsoft.com" replaced with "ser.fortissimum.net" so both are 19 characters long.
*Don't forget to route the new domains to the server i.p!
Lets hope the explanation is understandable