My MacBook boots into recovery no matter what I select as a startup disk
I found that the EFI Partition was faulty and that I still can boot into my Debian 10 Live Medium so the solution was to reinstall macOS or to fix the EFI partition
In my case, I simply need to reinstall macOS/OS X Snow Leopard and then repatch the El Capitan installer and install and then, I'm done (Yes, I can just repair the EFI partition but I've erased my disk without doing it in purpose).
In the case of others, just reinstalling (without erasing anything) will fix the issue.
I hope that everyone is doing well and that my answer helped.
Vitali64