it's actually quite clear you have done no research and have just come to the conclusion that Manning can do no wrong
You're wrong again. Celebrities/Public figures can and have successfully sued for libel (slander is verbal, not written, but I did use that term earlier). The bar is certainly higher, but it has been done by many celebrities when they are able to prove that the statement was a lie
and they held no regard for the truth.
No, it's not. You can certainly pretend it is, but again, by all accounts, something happened that day. Every media outlet has cited the sworn affidavits from everyone involved and it's not an opinion, but a fact that Manning, while getting his foot examined by Nouright, pulled his pants down and exposed himself.
Now, you can choose to believe that he was mooning a teammate, which is what Manning said in the affidavit. Or you can believe Nouright's account, that he did that to her and there was contact, but you can not intelligently conclude, that the incident is made up. Manning admitted it, in a sworn affidavit and if the media was lying about what was in the affidavit or the existence of one, it would be as clear of a case of libel as you can get.
But, just incase you want to continue believing that the media made up this incident, here is the affidavit
https://mgtvwate.files.wordpress.com/2016/02/peytonmanningaffidavit.pdf
and here, in Peyton's Manning words is what happened
"I was sitting on the training table, wearing a T-shirt, a pair of shorts and a jock strap ... Ms. [Naughright] came into the room to ask me about my foot. She then asked me to hop off the table so she could examine my foot. I hopped off the table and continued my discussion with [Malcolm] Saxon.
Once off the table, Ms. [Naughright] moved behind me so that she could examine my foot. At that point, Mr. Saxon made a comment to me intended as a joke ... After hearing his comment, I pulled down my shorts for about one second to expose my buttocks to him, or as is colloquially known, to 'moon' him."
But I guess you
could believe that the affidavit is a fabrication as well