BIP32 is applicable to both Bitcoin and Ethereum: BIP32 is a standard for hierarchical deterministic (HD) key generation and is used in both Bitcoin and Ethereum, among other cryptocurrencies.

Bech32 is used for SegWit addresses. If you're generating a Legacy or P2SH address, you'll need to use Base58Check encoding instead.

And you can see at the end of the code that IT IS showing the WIF format for a private key.