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.

I appreciate that context!