Preheat the air fryer to 375°F while you press and prep the tofu.
Press tofu 20–30 minutes to remove excess water, then cut into 1-inch cubes and pat dry with paper towels.
Whisk soy sauce, sesame oil, rice vinegar, maple syrup, garlic, and ginger in a bowl; toss tofu gently with 1 tablespoon oil and 1 tablespoon of the sauce for 1 minute.
Place cornstarch in a zip-top bag, add tofu cubes, seal, and shake until each cube has a light, even dusting; discard excess cornstarch.
Arrange cubes in a single layer in the air fryer basket, brush or spray with remaining 1 tablespoon oil, and cook at 375°F for 6 minutes; shake basket or flip cubes.
Increase heat to 400°F and air-fry 4–6 more minutes until golden-brown and edges are crackled; season with remaining ¼ teaspoon salt and serve with scallions.