The contention to the contrary is still sometimes agitated by the Minister, but that is plainly wrong. If authority is needed, see ARG15 v Minister for Immigration and Border Protection [2016] FCAFC 174 at [47]:
… Illogicality or irrationality in that extreme sense may be considered not only in relation to the end result, but also extends to fact finding which leads to the end result, albeit that, as Robertson J emphasised in SZRKT at [151], the overarching question is whether the decision was affected by jurisdictional error (see also the observations of Beech-Jones J in BKE v Office of Children’s Guardian [2015] NSWSC 523 at [113] and the cases referred to therein).