No, AST is definitely this games Time Mage.
The series regularly bundles 'space/time' magic together.
AST already has Lightspeed (haste), Gravity, and used to exclusively use Break (typically a time magic spell to petrify but in this case, it's heavy or 'slow)

Time magic is typically entirely crowd control or support, outside of gravity type spells, it made sense to build a healer around it.