Yes, the topic was closed for discussion because you said you were going to throw in the towel and try again in a few years:
If you aren’t going to use Garuda Linux, nothing to troubleshoot and no reason to leave the discussion open. Not for nothing, but “I tried installing Garuda but gave up” is not a topic that provides much value for the forum.
Yes you did, you missed the grub2 option. 
The grub2 option is in not in the live environment, it is in Ventoy (before you boot the ISO). This is an old picture from some random site on the internet but it looks something like this:
If you don’t have this option, you need to update Ventoy itself. See this article here: Get start . Ventoy