Does an active low pin need a pull up resistor?
Whether a signal needs a pull-up resistor depends on how it is driven.

If the driving logic is open-drain or open-collector or a mechanical switch pulling down like in your example schematic, then a pull-up is required to ensure a valid high logic level is produced when the line is not driven.

If the driving logic has totem-pole drivers, then no pull-up is required (because the output is capable of driving the high level itself).

Open drain drivers are often used with active low signals, because it allows multiple drivers to be connected together, producing an active-low "wired-OR" logic. In this configuration, any one of several drivers can produce a low value on the line, and only if all the drivers release the line is a high value produced (by the pull-up). This configuration is common for things like reset and interrupt signals.