Is truth a complete defence against defamation?Dutton sued a guy...

Is truth a complete defence against defamation?
Dutton sued a guy on twitter for saying Dutton was a rape apologist.

If Dutton doesn't sue Laura Tingle for a much more public speech, does that mean he accepts she is correct and that he has been stoking racism?

And if Dutton accepts that what Laura Tingle is saying is the truth, then why should Justin Stevens do anything?

Truth in reporting is what the ABC should aspire to after all.