I think its fair as well, but is it a "red flag"?
The redzone efficiency statistic is designed as an indicator of scoring proficiency. One of the assumptions of the indicator is that good offensive teams score TDS in the redzone because they are closer to the end zone. They SHOULD score. Is that a good assumption to make? In the rams case last year, its not. They were the highest scoring team despite being average in the redzone. Yes the rams left some redzone points on the field, but they also mae up for it by scoring when they were not supposed to score (outside the redzone). Is that a red flag?
