I think notion that 6.9.f isn't meant to cover the spider cam is far fetched , to say the least.
I am sure that 6.9.f was invented specially BECAUSE of the spider cam .. they have become ubiquitous and it suddenly occurred to WR that one day the ball will hit one, and they should have a Law to cover it
It has already happened.
2009 Wales v France
One of the most bizarre incidents to have happened on a pitch then unfolded, scrum-half Mike Phillips' kick hitting the overhead camera, albeit without any direct impact on the contest. Referee was Mark Lawrence.
2016 Australia v England Wallabies coach Michael Cheika's dissatisfaction over the officiating in his team's 3-0 series defeat by England has hit overdrive after the referee failed to intervene when the ball hit an overhead camera wire. Referee Nigel Owens
https://www.abc.net.au/news/2016-06-26/wallabies-michael-cheika-cry-foul-england-spidercam/7544234
In the 2017 book, "dead" was only defined in the Definitions[LAws]Dead: The ball is out of play. This happens when the ball has gone outside the playing area and remained there, or when the referee has blown the whistle to indicate a stoppage in play, or when a conversion kick has been taken.[/LAws]
There was nothing in Law 6.
2019 [LAWS]
Dead: The ball is dead when the referee blows the whistle to stop play or following an unsuccessful conversion.[/LAWS]
The link in the on-line version takes you to a list of places where the word "dead" is used in the laws. (Why else would you look in Law 6?)
6.9 (f) does not say what should happen, but since the ball is now dead, presumably we cannot just play on.
Scrum? 19.1 [LAWS]The referee awards a scrum for any other reason not covered in law[/LAWS] on the basis that the consequence is not covered even though the reason is.
Free Kick? 20.1 requires an infringement.
"While the ball is dead"? Maybe.
"Any infringement that takes place outside the playing area while the ball is in play"? The ball is outside the playing area, but no longer in play.