Maze of Ith does yet another thing

Wasn't sure where to post this. This is from the GP Columbus Quarterfinals between Tomoharu Saito and Brad Nelson:

Meanwhile, Confidant was still providing the goods. Nelson revealed a Thoughseize and immediately cast it, revealing Reejerey, Daze, Mutavault and Underground Sea. Nelson chose to take the Lord, and attacked with a now 3/4 Tarmogoyf. He also used the Maze of Ith he played pre-combat to untap his Tarmogoyf after it had dealt its damage. Sensei's Divining Top finished off the turn.

I was not aware you could do that. So in addition to stopping any targetable attacker, it also acts as a poor-man's vigilance. Awesome!

yea, an attacker is still an attacker during the end of combat step.

Rule 511.3. wrote: As soon as the end of combat step ends, all creatures and planeswalkers are removed from
combat. After the end of combat step ends, the combat phase is over and the postcombat main phase
begins (see rule 505).

the Glossary wrote:Attacking Creature
A creature that has either been declared as part of a legal attack during the combat phase (once all costs to
attack, if any, have been paid), or a creature that has been put onto the battlefield attacking. It remains an
attacking creature until it’s removed from combat or the combat phase ends, whichever comes first. See
rule 508, “Declare Attackers Step.”