Continuing the translation after I realized I missed material info on the last 3 sentences:
What this "certain type aircraft" is would be up to imagination![]()
Are you suggesting F-35?A type of 35 that’s not Su-35, Draken, MiG-35, or Mi-35.
Considering the drill took place in 2019 in western China, the first "certain type of aircraft" must be one of the aircraft types participating the same drill, likely J-20 to be worth mentioning, with which the J-16 flew "in composition formation to practice basic tactics" (与某型飞机混编基本战术). Does this make it the first revelation (or hint) that J-20 has taken part in a Shaheen drill?
The second "certain type" should be a "certain type of formation" (某种类型编队) but not a specific type of aircrafts.