Definitiv nicht. Sie werden verdeckt abgelegt, die Symbole zählen nur in der Endwertung.
In der englischen Regel auf Seite 5:
Red cards have effects that happen immediately and do not provide any additional impact after they are played, other than the tags they provide that can be referenced by other cards.
Das hab ich gänzlich anders in Erinnerung - es zählen doch nur die im Moment des Ausspielens ausliegenden Symbole?!
Seite 7 (in einer "note" box):
NOTE: Some production cards increase their production when you have more of a specific tag. You’ll need to update your player mat every time you play that tag.
NOTE: You will always be able to calculate your current production and capabilities by looking at your cards in play.