Having delivered servers to the big CSPs, I can tell you this is a very tough market. The CSPs are technically very savvy, and buy in huge volumes, so their cost leverage is strong.
The question here is what HP brings to the table. It isn't support, since the CSPs use limited repai philosophies, and can handle technical issues themselves. It isn't volume buying power, since the CSPs are doing just fine going direct to the ODMs. It isn't technology savvy, since the Googles of the world are so far ahead of "mainstream" design philosophies that they would be teaching HP the business.
This play doesn't make great sense as stated...going after the 20 titans. It makes much more sense for enterprise private clouds and boutique second-tier CSPs or SaaS providers who don't have the skills or leverage to go to the ODMs direct.