The jury has to follow the jury instructions. Not the court of public opinion's instructions. Most juries take their job very serious and follow the exact rules they are told to follow. The court will tell them exactly what questions they have to answer to get a guilty verdict.
This is what Irvin's side has to prove
Also since Irvice is a public figure he has to prove actual Malice:
https://www.law.cornell.edu/wex/defamation#:~:text=To prove prima facie defamation,entity who is the subject
No where in there is there the question of why would she do this and what does she have to gain. Now can he prove all 5 elements? That remains to be seen, but this is why people are going to be put on the stand. Until we know exactly what was told to the NFL, its going to be hard to see which way this will go. However, if this goes to trial, which I don't think it will, Irvin's legal team is going to ask her what she said, they are going to ask the manage what she told them. They are going to ask the manager what he told the NFL, they are going to ask the NFL employees what they were told. The video is going to be important as it will show the length of the encounter as well as if there was or was not any physical contact. If she approached him and the encounter ended with a handshake, then that is going to help show that it was a friendly encounter from Irvin's perspective (not prove definitively).
I can see this going many different ways at least until we get more info. I can see that she told her manager that Irvin hit on her and asked her to come up to his room. I can see a jealous manager who was crushing on the employee. I can see a NFLN employee over reacting. I can see a simple misunderstanding. The one thing I am having a hard time with is a conversation of less than a minute that ended that was initiated by the woman and ending in a handshake resulting in misconduct. What can you say in that short period of time that would cause you to get kicked out of the hotel at 5am? Did he ask for prositutes sent up to his room? Did he ask for drugs?