Can a Hong Kong team visa fly directly?

You can't. L-sign is a kind of "group travel endorsement". For most cities, this is an L-shaped sign. If you want to leave the country with a group, L-sign can't fly directly to China and Hongkong. G sign is a "personal travel endorsement", which is restricted by the city. You don't have to join a group to go abroad, you can freely enter and leave China Mainland and Hong Kong, and you can fly directly from the Mainland to Hong Kong.