Sort of, but good Samaritan laws generally would protect the person. They still could be fired for helping even if nothing goes wrong, because they're not trained for that and immediately firing you might help a potential legal defense (and they don't care at all about employees or morale because of the brutality of late stage capitalism). The company would be on the hook either way

A brave person would have helped anyways and took it online if they faced repercussions, a smart person would have whispered to the guy "I could lose my job if you tell anyone I told you this, but if you take a stand you'll win. Obviously we need the plane, and it's not like we can put you on the no fly list for this. I'm sorry, this isn't right, but I need my job"

A person working for a healthy company would've apologized profusely for the wait and called around the airport until they found a chair... There's a 0% chance this wasn't an option, it would've made the airline look bad, but not publicly... Unless they'd already burned so many bridges they couldn't ask the airport (or even other airlines, competition or no it's not a hard sell if you're cordial to the people you work around)