The Windows tool Diskpart overwrites all data on the hard drive with a zero, which is considered a secure deletion method. This applies at least to classic hard drives, i.e. HDDs with magnetic discs.
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The disk in question is disk04 - a 128 GB SSD drive in an external USB enclosure. I booted the Macbook from a X.11 USB install drive and there was an internal SSD drive as well. a simple fdisk ...
Launching the DiskPart is not a big task. You are just required to open the Windows command terminals, either the Command Prompt or Windows PowerShell with the administrative rights. In this ...