If you run the command
cryptsetup luksDump /dev/sda5 (change device to whatever LUKS encrypted device), you will get an output, and at the end there is a section “Digests” which contains something like this:
Digests: 0: pbkdf2 Hash: sha256 Iterations: 104492
What does this section represent? Why does it show sha256 here and argon2i in the Keyslots section?
The Keyslots section shows the password hash used as argon2i:
Keyslots: 0: luks2 Key: 512 bits Priority: normal Cipher: aes-xts-plain64 Cipher key: 512 bits PBKDF: argon2i