There was a temporary bug in Google Domains that made it appear as if he had bought google.com, but he had not.
https://www.verisign.com/en_US/channel-resources/domain-regi... https://krebsonsecurity.com/2020/01/does-your-domain-have-a-...
It's a recommended best-practice for high-value sites, which the main website of any Fortune 500 company certainly falls under.
The guy in the article did in fact buy a google.tld - https://google.xn--9dbq2a/
So because they could do it, anyone who points out it's not possible now should be downvoted and asked to explain themselves with:
Why is it not possible, beside the fact that it's not possible?
[Edited to remove excess frustration/annoyance/snark at people quibbling so much about a totally inconsequential and factual remark.]
It's possible that google and other major brand names don't have to register every extension, the names are just reserved for them alone, should they want them.