> If a court reviews a decision of an administrative body, the court typically starts with the assumption that the decision was correct
In the US, at least, it varies considerably by the exact kind of decision and the context in which it is being applied, ranging from extremely strong deference (Chevron deference) to anti-deference in some contexts. And opposing Chevron deference was an overt priority of the Trump Administration in judicial selection, so in general it would be reasonable to expect deference overall in the US to wane for some time.
In the US, at least, it varies considerably by the exact kind of decision and the context in which it is being applied, ranging from extremely strong deference (Chevron deference) to anti-deference in some contexts. And opposing Chevron deference was an overt priority of the Trump Administration in judicial selection, so in general it would be reasonable to expect deference overall in the US to wane for some time.