Pretty much this. A lot of the mechanical details show almost no understanding of how tanks actually work in this game on a mechanical level. Also the lore presented, although providing a mildly interesting story premise, shows little knowledge the full lore of Astrologians, especially when Time Mages in the game are simply considered to be empowered Astrologians.
That being said, the basic concept of a chronomancy-themed tank is something I like, and would definitely loved to see this polished, balanced and fleshed out more after looking through lore for Astrologians and definitely taking a look at Time Mages in Final Fantasy XII (a.k.a. the Time Battlemages).