How do I get plymouth to show up with a unified kernel image?

Title. I use a unified kernel image with mkinitcpio and I use the hardened kernel (if it matters). I want to enable plymouth splash on boot. I followed all the steps I found online and plymouth works, but it doesn't show up by default.

I have my /root and /home as subvolumes of an encrypted btrfs filesystem. So the prompt for that comes up first, but I have to press Escape for the plymouth screen to show. Otherwise it doesn't. I know the plymouth supports entering the encryption password, so ideally I would want to enter the password from the splash screen. Any idea what is going wrong?

/etc/mkinitcpio.conf

MODULES=(btrfs)
BINARIES=(/usr/bin/btrfs) 
FILES=() 
HOOKS=(base plymouth udev autodetect keyboard keymap modconf block encrypt filesystems fsck)

/etc/mkinitcpio.d/linux-hardened.preset

# mkinitcpio preset file for the 'linux-hardened' package
# ALL_config="/etc/mkinitcpio.conf"
ALL_kver="/boot/vmlinuz-linux-hardened"
ALL_microcode=(/boot/*-ucode.img)
PRESETS=('default' 'fallback')
# default_config="/etc/mkinitcpio.conf"
# default_image="/boot/initramfs-linux-hardened.img"
default_uki="/boot/EFI/Linux/arch-linux-hardened.efi" 
default_options="quiet splash"
# fallback_config="/etc/mkinitcpio.conf"
# fallback_image="/boot/initramfs-linux-hardened-fallback.img"
fallback_uki="/boot/EFI/Linux/arch-linux-hardened-fallback.efi" 
fallback_options="-S autodetect"

/var/log/archinstall/install.log

Thanks a lot for your help!

Edit:

Forgot to add parameters to /etc/kernel/cmdline. Should have just RTFM