[Jemian]

at is the name of the ... female who voice-recorded the “stay away from the RV” message?

That message could have been Warner himself and digitally altered. There is software out there which does that and it is very easy to do.

[hecticskeptic]

....female who voice-recorded the “stay away from the RV” message....
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https://streamable.com/bnfmcd

The examination of the acoustic signature of the voice rather convincing supports the opinion that it’s actually Microsoft Anna.