Unfortunately yes.
You could raise a feature request asking for an inverted logic option for this integration.
https://community.home-assistant.io/c/feature-requests/13
There’s a hardware hack that will work too.
If you mount another magnet near the reed switch it will turn it on. When the magnet attached to the window comes close the two magnetic fields cancel and the reed switch turns off. I’ve used this trick to turn normally open reed switches into normally closed switches before.
Finally, I’m pretty sure this won’t work but you could try it:
Put this your customize.yaml file:
binary_sensor.your_lcn_sensor_here:
invert_logic: true