Sorry, I do not know french
Waiting for a french speaker to answer...
Yes, I agree with you that this is a problem, posted about it here
I think that Cintra event should appear in red with a newspaper explanation. Your Armee of Portugal has been defeated and you have lost Lisboa, but due to a more than satisfactory agreement with the english command your troops are allowed to abandon Portugal safely, thanks Dalrymple
These troops will appear again when Napoleon arrives to the peninsula
This is the contrary of what happened after the battle of Bailen. French troops were transfered to Cabrera island, near Mallorca, and many dead there abandoned. Dupont was not among them though