Using your entire brain cell, you don't make sense.
How could there have been an "incident" to film if they had not already been asked to leave?
Which is it?
Facts please.
First off, I agree that if a manager, I'd have told the 'white woman' to choose another establishment and not have even approached the party of 24, $$ count.
Since all we have to go on is your link, the manager didn't do what I would have. Instead, he/she went to the party and said they wouldn't seat them in the section of the 'white woman that complained,' which implies they were going to seat them elsewhere, but when filming started, he/she refused service.
That is how TASB got 'there.'
BTW, based on the one side only, I agree they probably have legal recourse from the get go.