Yep, it's basically just a marinade, but it's supposed to have some flavors that bring to mind feta. The recipe for the marinade is from Cheap Lazy Vegan:
1 block tofu firm or extra firm tofu, pressed and cut into small cubes
2 tbsp nutritional yeast
2 tbsp miso paste
2 tbsp olive oil
2 tbsp lemon juice
2 tbsp apple cider vinegar
1 tbsp garlic powder
1 tbsp dried oregano
1 tsp Salt
It says to marinate for at least an hour, but I usually do it for several hours. It's been around 8 hours, so it should be good to go for dinner.

I really like it.