It means that the director Ridley Scott showed little or no interest in filmmaking during the specified time interval.
cold in manner or appearance
especially : coolly dispassionate
And from TFD:
Cold-bloodedly dispassionate : a cold-eyed appraisal of the situation.
So, to look at something with a cold eye means to regard it rather distantly – it's not capturing your attention, and you're not giving it much thought.
Also, the phrase cast a cold eye at may be a pun in this case. In phrases like cast your eyes or cast a glance, the verb cast means "to look at or direct one's attention toward". But the word cast is also related to filmmaking, so the author may have been trying to be clever here.