I only see a .pkg file when restoring from DMG in TransMac. What is wrong?

I finally got my hands on a second-hand MacBook Pro (Early 2011). However, the disk is corrupted and doesn't boot, and Internet Recovery proves ineffective as the OS X Lion Setup fails. This is the only somewhat-modern Mac that I own, so I tried to make a USB installer via windows. I used a genuine Apple install DMG (*Located Here: https://support.apple.com/en-us/HT211683*) , and when I go and restore the USB with the DMG file I only see a .pkg file, in place of the installer files. It also doesn't show up in the boot menu of the Macbook. I have seen other people have success with this method, so I'm not seeing what I'm doing wrong. (*See here: https://www.youtube.com/watch?v=4OpF0jJMJzI*) What should I do differently?