Given that he just performed one Black Flash, he could now potentially now be in the zone and, if that is the case, he can then launch a barrage of Black Flashes and defeat Mahoraga in battle.

Source: https://gamerant.com/jujutsu-kaisen-chapter-233-spoilers-release-date/

In fact, Mahoraga even gave Gojo some problems when they fought.

Source: https://gamerant.com/jujutsu-kaisen-jjk-strongest-shikigami-users/

One of the strongest abilities that Megumi possesses is the ability to summon the strongest of the 10 shikigami, Mahoraga.

Source: https://gamerant.com/jujutsu-kaisen-jjk-characters-defeat-mahoraga/

The only one that might be capable of doing so is the most powerful of all -- and Sukuna’s main interest -- the 8-Handled Sword Divergent Sila Divine General Mahoraga.

Source: https://www.cbr.com/jujutsu-kaisen-chapter-219-gojo-most-dangerous-foe-sukuna/