It also uses a cloud fingerprint database apparently according to the second paragraph:

If you turn on “Show search button on lock screen”, each time you tap to search Google receives a short, digital audio fingerprint to identify what’s playing.

On Linux, the desktop client of Webex still does not support the chat feature, so you’re forced to use Firefox or whatever browser to join meetings instead. The best part is that some Webex rep said they’d add this feature to the client back on 2023, and it’s now 2024 and it’s STILL NOT HERE.