I don't know anything about Deakin. I'd say if he has a reasonable level of support (10% - 15% or more), then he should be included in any debates. But if he's just a dreamer with practically zero chance of winning, then he shouldn't be included. - That's roughly how most debate participants are usually included or excluded.
Supposedly Deakin’s campaign said he submitted enough signatures to qualify for the ballot. Deakin should be allowed to any debate for the seat.