Try to erase data, but also get a message 'data creation?

Try to erase data using disk utility, I get a message "Erase Macintosh HD and creating Macintosh HD".  I disabled the time machine backup, so I don't know why it looks like it will also create data. Any ideas? Please see the image below. I sell this mac so I need to make sure that all the data is gone.

It does not create data

Tags: Notebooks

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