Place pork tenderloin into the bottom of a multi-functional pressure cooker (such as Instant Pot®). Combine 3/4 cup chicken broth, soy sauce, honey, rice vinegar, garlic, ginger, onion powder, and sesame oil in a small bowl; stir to combine. Pour marinade over the tenderloin and turn to coat.

Close and lock the lid. Select high pressure according to manufacturer's instructions; set timer for 3 minutes. Allow 10 to 15 minutes for pressure to build.

Release pressure carefully using the quick-release method according to manufacturer's instructions, about 5 minutes. Unlock and remove the lid. Immediately remove pork tenderloin to a warm plate. (The pork will not be completely cooked at this stage.)

Stir together 2 tablespoons of chicken broth and cornstarch in a bowl to make a slurry. Select Saute function (medium) and add slurry to liquid in the pot. Cook, stirring constantly, until liquid thickens. Cancel Saute function.

Slice pork thinly, place in the pot, and allow the residual heat to complete the cooking process, about 3 to 5 minutes. Remove pork to a serving dish and sprinkle with green onion and sesame seeds.