The rent controlled apartments called "Rent Controlled" are just one part of the problem. As these people needed to rent their apartment starting in 1971 those 27,000 apartments are rented by retired people. Which generally don't do daily commutes but do reduce density making other peoples commutes longer.

The much larger rent controlled group aka "Rent Stabilized" includes plenty of retired people, but also many working people who are discouraged from moving due to their below market price rent and the difficulty in finding new apartments. The working fraction of that much larger group creates congestion issues from these longer commutes, while the retired people reduce effective density.

TLDR; I am making more than one argument for why each type of rent control is part of the problem.