How can you explain that the following reaction is oxidation in terms of increase of oxidation number?

Al3++3e−→Al0


In this reaction, the oxidation state of aluminum decreases from +3 in Al3 to 0 in metallic aluminum (Al0). Since the oxidation number decreases, this is a reduction reaction, not oxidation. However, oxidation in terms of increasing oxidation number typically occurs when electrons are lost. This specific reaction is an example of reduction.

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