alt Hacker NewsAlphabet and Meta are misclassed, they are information technology.
Tesla should (probably) be in industrials, as a car and battery tech company.
Amazon is hard to class, you might check if they break out to subsidiaries for AWS versus consumer retail. Part is definitely competing with Walmart.
At a glance, I think the author used S&P sector categorizations. They were set in 2018 and intentionally split the mega caps/FAANG/MAG7 across multiple sectors based on some hand waving about “primary” revenue source at that time.
From a finance perspective I think they’re a _little_ weird but functional (NVDA moves with semis, MSFT with software, etc) whereas from a tech perspective I’d say very weird until you learn about the backstory and what motivated it.