I'm still trying to understand why people say he flopped/faked a head injury....to take himself out of the game on the game winning drive

...it literally is the complete opposite of trying to help your team win..
not saying he did fake it but did you even watch the game?
the penalty put them in fg range and the offense never took another snap after that.They just kicked the fg
if the injury never happens then Pitt has the ball with 18 seconds,no timeouts,and 15 yards away from their kickers season long fg
all the bengals wouldve had to do was protect the sidelines.Any pass in bounds wouldve ended the game
if you cant understand how flopping in that situation wouldve helped them win i dont know what to tell you
you either dont understand football or you didnt watch the game