Are you sure? Can you give me an explanation if you don't mind?
Can google consider those backlinks if they are relevant and high quality?This is know since at least 15 years ago. As google can see the IPs, so can they see trivial hacks like hosting your domains on the same IP. This is the basic of the basics, and they can see much more than that.
ofcourse... the only problem of sharing multiple sites the same ip all linked to you is that you can receive a penalty for artificial link profile easy...Can Google consider backlinks from different websites but same IPs?