I don't think what he's saying is incorrect per se. Potters Bar to London King's Cross CDR's ("Cheap Day tickets," whatever) are not valid on this service. Off-Peak Travelcards are also not valid on this service.
Is
is incorrect.:roll:
Travelcard - correct, that's about the only correct claim made here!
Cheap Day - no longer exists!
But he says a train is a "peak trip period service" which is nonsense!
He says that passengers with invalid tickets are "liable to an added penalty fare" this is incorrect, if you hold an invalid ticket due to a time restriction a PF cannot be charged!
He also says "The first service that is accepting off peak tickets is ..." but that's incorrect. It is correct for some off peak tickets, but not for other off peak tickets, for example ALL off peak tickets to anywhere
outside the Network Area is valid on earlier trains, and SOME off peak tickets to places inside the Network Area are valid (e.g. the return portion of an Ashford to Potters Bar would be valid on the 0931 to give just one example, anyone holding such a ticket may be led to believe they are liable to a PF which is nonsense).
Similar manual announcements are made at Manchester Piccadilly - e.g. "The next train to depart from Platform 7 is the [09:35] Virgin Trains service to London Euston. This is the first Off-Peak train to London." (Even though it isn't if you have a ticket from Lancaster.)
okay that's not ideal wording but it's hardly in the same league as the FCC announcement, for one thing it doesn't give old ticket names, for another it will only affect people with selected origins who are unlikely to take that route, and it also doesn't make threats that passengers will be liable to extra charges beyond an excess.
It would be very long winded for the announcer to say: "This is the first Off-Peak train to London for customers holding Manchester to London tickets. Tickets from other stations to London may be valid on this train." (It might also encourage people to look for tickets that can be used on earlier services!

)
The first part would suffice, or even simply "This is the first off peak service to London from Manchester" (if anyone had a different origin and wasn't sure they could check).
It is reasonable for announcers to assume that customers have tickets from the station where the announcement is being made.
You've destroyed your argument above then!
With regards to Potters Bar, however, it is not reasonable to call the train a "peak time service," as this can cause additional confusion. The main problem comes when RPI's won't accept Off-Peak tickets that are valid on the train.
Yes but it's still unfair on people to be unnecessarily worrying just as their train pulls in that they may not be valid! Some people may decide not to take the train and miss an onward connection due to the fear of getting a PF.