bitcoinjs-lib seems to skip a step in deriving addresses from a BIP 44 wallet

According to this wiki page to create a bitcoin address,

1) you have your public key of the properly derived path

2) Then SHA256 it

3) Then RIPEMD-160 it,

Add version byte at the front and boom blam you’re good.

But in bitcoinjs-lib, they have this function getAddress which seems to skip step 1 and continue down the path ensuring Base58Checking

function getAddress (node) {
  return baddress.toBase58Check(bcrypto.hash160(node.publicKey), bitcoin.networks.bitcoin.pubKeyHash)
}

My question is, why is bitcoinjs-lib skipping step 1? Don’t you have to SHA256 the pub key again?

Derivation occurs pretty straightforwardly with derivePath

var child1 = root.derivePath("m/44'/0'/0'/0/0")

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Cryptocurrency Expert