> I think that can reasonably be interpreted to say that they won't be running 6.
I'm not sure about that. 
The ordinary dictionary meaning of scheduled is "planned to happen at a particular time"

Five races were scheduled. Five scheduled races were run. One unscheduled race was run. I don't think that what we have seen of the NOR specifically precludes running an unscheduled race.  
I have known an event in champagne sailing conditions where the RC twiced asked the competitors if they wanted an extra race, and they ended up with two more than the original schedule.

On redress, I can see redress of average points for a boat that doesn't sail an unscheduled race, but throwing the race out completely doesn't feel fair to the other competitors. My inclination would be to give C average points for R6 on the grounds that, having sailed in, there was no way she could know there was going to be an unscheduled race, but OTOH if running an unscheduled race was not an improper action, what are the grounds for redress?

There were a couple of interesting questions raised above.  
1) If you were to provide advice with AI what would you train it with.   
I would train it first with the rule book, then I would give it the World Sailing Casebook, then I would give it any national authority Appeal books available online (RYA, US Sailing, Sail Canada).  I would probably add written decisions from major regattas with experienced trusted juries (Olympics, Olympic Class World Championships).  If I were training it to write decisions I would give it the Standard Wording document.  I would consider what other resources were available online and use them as well.  One of the reasons that we are behind on this is that not many articles are available online for AI to digest.  In other fields there is a lot more published.  I would consider some of the Sailing World rules articles, some of the articles on the rules in Dave Dellenbaugh's newsletter.  If I were doing it myself I would add my own articles (https://rcyc.ca/Sailing/Racing/Know_Your_Rules)
2) What have you used it for
I have done a quick experiment with this.  I don't know remember whether it was Claude or CoPilot.  I gave it the RRS and the standard wording.  I then gave it the facts founds by a fairly experienced protest committee and asked AI to write the conclusions.  Some parts were correct and in fact did better than the original protest committee.  Some parts need correction.  
I have used AI to help me review NoR and SIs.  For example I have asked "For major regatta's for xyz class do they modify such and such in the NoR"  I have been returned NoRs with and without the modification.  This can be very helpful.
I did try to use it to generate a pairing list for match racing.  It didn't do well at all.  

Rule 89.2 provides the option to change the NoR provided adequate notice is given.

As brought out by John d Farris, any change needs to be communicated to all stakeholders.

I was responding to your question about QR codes.

John,
Thank you for providing the link to the article posted by Graeme Hayward and originally written by Mary Pera.  It is sad that neither of them are with us any more.