Q1: Isn't it called "Free Territory" too?
A1: There is no prominent evidence that the territory ever went by that name. Of the variants that have historical evidence, "Makhnovshchina" was decided as the most fitting, referring to both the people and the occupied land, with little evidence that they treated the land as a named state. All evidence points to "Free Territory" being an anachronism invented and propagated by Wikipedia rather than a name supported by reliable sources. Given the damage Wikipedia has already made to the historical record here, the burden of evidence would have to be quite strong to prove that scholars have all missed the territory's proper name in their decades of publications.
Q2: Why is there no infobox?
A2: A request for comment in 2024 closed with a consensus against including an infobox. The Makhnovshchina was a movement and not a territory or country.