There is no evidence to suggest Google, or any other social media company, shifted 6 million votes to Joe Biden in the 2020 election. Firstly, most voting machines used in American elections are not connected to Wi-Fi or the Internet. This has been explained in the Dominion Voting Machines defamation lawsuit against Fox News, where the voting machine company sued media companies for spreading claims that their products resulted in voter fraud and were susceptible to tampering by outside influences. The case was settled before it went to trial, but as part of the settlement, Fox News acknowledged that it had spread falsehoods without evidence that such voting machines were subject to tampering.
As for Google's involvement, there is no known evidence of any such tampering on the part of Internet companies such as Google. As previously mentioned, many voting machines are not connected to the Internet and thus cannot be "hacked" or tampered with in such a way. While some voting machines can in fact be connected to the internet, there is no evidence that votes have been altered via hacking.