Not that I want to put down your efforts but, by far and large, this is inappropriate for most people and inapplicable to most laptops... It's a non-standard and very specific installation for your own laptop (for which you've not detailed any hardware specifications, we just see that it's an older Ivy Bridge platform) and, to top it all, your setup is incomplete/incorrect (eg: CPU power management, Clover config, etc.).
There's been a standard method to make up a USB Installer for some time (using the Apple's "createinstallmedia" line command), including Clover installation and that method is a lot more different that what you've chosen to follow and post without much in terms of explanations. By that, I mean the non-standard things you did such as:
creating a dedicated MBR/FAT32 EFI partition for Clover on your USB key for the onset (not required/mandatory)
creating an MBR-specific USB installer using a specific scripting tool, the origin of which you've not even specified
setting nVidia to VESA (not applicable on any laptop unless it has an nVidia GPU and even then...)
installing Catalina on an HFS+ formatted SSD (when standard macOS installation since High Sierra formats target disk APFS)
script of some sort to retrieve private user data
single-user boot to complete installation
Most people will follow the well-known standard method, rightly so.
You'd be well advised to rename that thread to "how to install macOS Catalina on XYZ laptop (make & model) with an MBR-partitioned USB key on an HFS+ disk" because it's everything but generic/standard and for any given laptop...