It states, "The Commissioner also had determined that the March 11, 2017, St. Patrick's Day parade incident in Dallas will not be considered separately as a basis for additional discipline under the Policy given the circumstances surrounding the incident."
Which is exactly that case I'm trying to make but either I'm not clearly articulating my point or you aren't understanding. The NFL previously tried to give a suspension of 2 games to Ray Rice, then attempted to increase the suspension once the tape was released. This, however, was overruled by a higher court stating the NFL cannot increase a suspension just because a tape was released, i.e., no new incidents or information were released - only a video representation of what he was suspended for in the first place. The decision of 6 games was made, they saw nothing to warrant additional time for the suspension based on that incident - if they try and backtrack and say "Well we're giving you 2 games for this incident" when the report clearly says 0 games for this, the precedent has already been set by the Ray Rice verdict of not being able to increase suspension time of an investigation that was already made and the outcome determined.
If they would have said up front "A combined series of incidents, including the St. Patrick's Day incident, we are giving you X number of games" they'd have a leg to stand on.