Yes, I agree with you, I think it's just a hoax because until now there has been no official announcement from Google about quantum computers. and I think if a quantum computer does exist then I'm sure bitcoin developers will improve security systems and strengthen block security. I'm sure bitcoin developers will try hard to strengthen the bitcoin system and network.
Fake news or not I believe it's just a matter of time until we reach an unimaginable computer capability to calculate enormous number and that's technology development that can't be stopped. However, if there's any computer like that out there. i'm pretty sure that it'll not be in the hand of someone unresponsible. But, there's always a chance that it could go against any cryptocurrency so we should actually put our concern here rather than denying the reality.