[Odin] Boot log visible as console output between greeter and logout/shutdown, no boot animation (plymouth) on system startup

## What Happened
When I shutdown my computer, I get this weird writing before the computer shuts off.

## Expected Behavior
According to sub-reddit, this writing should only be present when installed in legacy mode (I installed in UEFI). I re-installed a second time (clean install) in UEFI mode and same writing in screen at shutdown. I should see the device logo, but I do not. I ran the command "sudo nano /etc/default/grub" and have this setting: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash". The splash screen should be persistent after next reboot, but it is not.

See this sub-reddit post as I am not the only one with this issue:
https://www.reddit.com/r/elementaryos/comments/p33wma/anybody_else_have_this_screen_on_shut_down_and/

There seems to be a solution here:
https://elementaryos.stackexchange.com/questions/28374/shutdown-splash-not-working/28377?noredirect=1#comment28209_28377
but did not try it.

## Steps to Reproduce
1. Shutdown my computer
2. (see writing of shutdown screen attached)

## Platform Information
* elementary OS 6 Odin
* I did not install any proprietary drivers.
* Dual-Core Intel® Core™ i7-2620M CPU @ 2.70GHz; Intel® Sandybridge Mobile; 7.7 GiB memory; 486.9 GB storage