Thanks so much for leaving a positive review and glad to hear you liked the dish 🙂 I really like to use fermented tofu in the marinade. It’s a specialty ingredient so I was hesitated to include it, but now I’m glad I did!

You can definitely cook it in an air fryer. For air fryer cooking, I would cook at 400F (200C) for a total 20 to 25 minutes, flip every 4 to 5 minutes and glaze the chicken on both sides.
The method would be very similar to the air fryer char siu pork: https://omnivorescookbook.com/air-fryer-char-siu-pork/ It cooks different from the oven, but should achieve a great result.
During air frying, if the glaze start to burn, you can lower the temperature, 25F at a time, until the chicken is cooked through (use a knife to poke the thickest part and the juice should run clear).

You should store the opened fermented tofu in the fridge. It is like other preserved food, it lasts for a very long time but will slowly dry out and lose fragrance. I recommend finishing the jar within a year.