Michel, you are correct. The most recent BG has a greater impact on A1C.
Indeed, dead RBC’s have no affect on the A1C reading, as they are removed from the body. And certainly a greater number of RBC’s from 2 months ago will be dead than the newer RBC’s.
This link clarifies it:
Will the A1C test show short-term changes in blood glucose levels?
Large changes in your blood glucose levels over the past month will show up in your A1C test result, but the A1C test doesn’t show sudden, temporary increases or decreases in blood glucose levels. Even though A1C results represent a long-term average, blood glucose levels within the past 30 days have a greater effect on the A1C reading than those in previous months.