It could be that Googles interest in him is that they are planning to integrate the Ethereum blockchain into their product line. They have a history of finding promising open source technology and then making it their own. I would view Googles apparent interest as a positive and not a negative for Ethereum.
Google will usually buy companies in a space that they want to move into, but how do you buy a Blockchain? You can't. Your next best option is that you hire the top talent with knowledge that you want to integrate into your own products. If this information turns out to be more than a rumour it could mean that Google is getting ready to integrate Etherium into its own product offerings.