Understanding IC max current in Datasheets
You are not wrong. The IC has a global limit of 70 mA.

However, driving a LED at 20 mA is often unnecessary today. You should make sure that the design actually tries to do that. The current supplied to the LED depends (most likely in this case) on the current limiting resistor and the LED IV-curve. A simple indicator LED will be fine at 5 mA.