You don't need to be closer to GOOGL to look at their 10-K.

https://www.sec.gov/Archives/edgar/data/1652044/000165204426...

On page numbered 60, you can see the Disaggregated Revenues.

The $30B quote seems to be referencing "Google Network" revenues declining from $31B in 2023 to $30B in 2025. "Google Network" is grouped with "YouTube ads" and "Google Search & other" to comprise the "Google advertising" category of revenues which increased from $238B in 2023 to $295B in 2025.

So yea, "ad tech" does not represent the whole of Google's advertising revenue.