[gazebo_plugins] gazebo_ros_p3d noise model

[Maxx84]

Hi,
I'm a bit puzzled about the implementation of the noise model in the gazebo_ros_p3d plugin.
My assumption is that the purpose of the P3D plugin is to provide Ground Truth robot pose data.
I would like to pass a gaussianNoise value (standard deviation) to the plugin to inject some uncertainty in the published pose data.
However, it looks like the current implementation (at least for Noetic) applies the noise only to the Twist component of the Odometry message: https://github.com/ros-simulation/gazebo_ros_pkgs/blob/noetic-devel/gazebo_plugins/src/gazebo_ros_p3d.cpp#L340-L361
Is that on purpose?
Why does the Odometry message even contain a Twist component?
Thanks,
Massimo