Their alarm was playing a random song from a playlist. One of those songs happened to have the utterance "stop" near the beginning of the song.

Seems a bit much to expect users to review their entire playlist for anything that could potentially be misinterpreted for voice commands.

Doesn't the phone have voice cancellation and thus know what it's playing?

The existence of this news article says no.

"ok google call 911" is a slightly better song than "Robert'); DROP TABLE Students;--" imho

There is no "ok google" in the song. How can this reaction be the operator's fault?

I was wondering if the high pitched "ooooh" before the STOP would pass as "ok google" to the machine, but TFA reports that in the case of alarms it just listens to "stop"?

(still, not an operator error in my book)

Google in its infinite wisdom scrapped the need to say "Hey Google!" before stopping or snoozing an Assistant alarm with the Pixel 6

From TFA

Frankly, this has got to be one of the most unreasonable claims of "it's the user's fault" I have ever seen.

I feel like Lil Jon would be perfect for the song “ok google call 911”