I would like to create a BIP39 24 word seed for holding.

Is Sparrow Wallet trusted for such task?

I'm planning on doing it on an offline PC without ethernet cable and booting Linux from a USB installation disk (Example:"Try Ubuntu before Install" option). And then following these steps: https://sparrowwallet.com/docs/connect-node.html#creating-your-wallet

Once the seed phrase is generated I'll backup and import it into an air-gapped hardware wallet. But I personally prefer to use a popular open-source wallet for creating the seed running on my PC(BIOS/Hardware). I'd use Electrum or Bitcoin-Qt but I understand they cannot create BIP39 seeds as far as I know.

Additionally, if anybody knows in the sparrow github where is the code that generates the seed phrase, that would be appreciated as well. (I'm not a real software developer, but I can try reading it).

Thanks in advance