Muffin is correct HT, and so are you. Problem is that they likely did this at the beginning of their flight, and not before attempting to take off from their location.
I'll always do a full pre-flight before first flight of the day. Teletemps, GB oil and fuel levels, sump gas, and a precautionary glance over prior to any remaining liftoffs (if I've been flying it without interruption for the duration, otherwise another full preflight)
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Marc