The airdrop of zilla seems to be an early christmas bonus for us komodo hodlers. It is just like being given free assets. Come to think of with just around 11 million tokens supply , zilla will be valuable as time goes by and the projects potentially it will maintain.
Will this also be distributed when holding on ledger?
For sure because they can't know which wallet is behind an address. The problem is how to claim it if your KMD are on the ledger. Until Agama has no direct Ledger Support your only chance is to expose the private key from the Ledger (be careful, it's very unsecure, do this offline with an Ubuntu Live or similar) to have access to these zilla via Agama.
In my opinion it's MUCH easier to send your KMD to Agama wallet a few hours/days before the snapshot and after that send them back to the Ledger, but it's up to you.