Literally, the second sentence of the post says that she wasnt teying to show it was better for the environment. She was showing how impractical it was.

Then you step in and say "but her team was flown over the atlantic".

Greta: im not trying to make a point about private jets being bad for the environment and boats being a good alternative by sailing instead of flying

You: but you didn't prove that sailing is a good alternative to private jets by sailing instead of flying.

Right.