In contact with the team, I discovered that Airdrop supports only ERC223, and there is a growing demand for Airdrops for ERC20 tokens. It is suggested to improve the deployment of an Airdrop feature also for ERC20 tokens, this will greatly help developing projects in the expansion of their communities.
Sorry for late reply on this one @Erik_Rodrigues
To my knowledge it is possible for support for ERC20 to be added, will ask the question to DEV team and find out.
airdrop-tool v0.3.0 supports airdrops of both ERC223 and ERC20 tokens on both ETC and ETH networks.