Mnemonic Code Converter and Dice entropy

[testingelcrypto]

According to this site : https://iancoleman.io/bip39/ rolling a dice only gets 1.67bits is this correct?

[odolvlobo]

A 6-sided die gives log₂ 6 = 2.58 bits of entropy.

I didn't have the patience to explore the issue in depth, but someone was saying that the way the site processes the dice rolls results in only 1.67 bits.