Because sometimes, a VMs fails, so generate a new one creates a new IP, but if IP of first IP was given in a CVs or link in a forum, then it fails because it goes to the first failing IP.
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You can achieve this by using Portable Public IP address rather than default SoftLayer's Public IP address.
https://knowledgelayer.softlayer.com/articles/static-and-portable-ip-blocks
i.e. once you get the server, get another portable public IP and assign to that server of yours.
then you use that portable public IP as a primary.
if new replacement server is ready, then you can simply re-assign that portable public ip from old server to new server.