It might come down to the definition of posing or posturing but I'd be surprised if every leader hasn't "performed" while leading at one point or another in their career.

At a very young age I was put into a position of authority which required me to frequently exercise leadership. At times I found that I had to "perform" in order to create a desired outcome. I didn't think then and don't think now that there were any problems with this. I was still true to my values and authentic.

Of course, I was not there to experience it first hand, but your example seemed somewhere between friendly bantering among colleagues and blowhard bluster which can fall in the big white spaces between actually exercising leadership. Some are better than others but none are perfect.