rosdep is not installing pip dependencies

edit

Hello, I have a package perception with the following in package.xml:

<exec_depend>open3d-pip</exec_depend>
<exec_depend>pyrealsense2-pip</exec_depend>
<exec_depend>python-opencv</exec_depend>

The first two are packages I've added myself here: https://github.com/luisrayas3/rosdist... which is included in sources.list.d:

$ cat /etc/ros/rosdep/sources.list.d/10-luis.list
yaml https://github.com/luisrayas3/rosdistro/raw/master/rosdep/python.yaml

And in fact this does seem to not be the issue:

$ rosdep resolve pyrealsense2-pip
#pip
pyrealsense2

But rosdep does not try to install them:

$ rosdep install --simulate --reinstall perception
#[apt] Installation commands:
  sudo -H apt-get install ros-melodic-ros-base
  sudo -H apt-get install ros-melodic-image-common
  sudo -H apt-get install ros-melodic-image-transport-plugins
  sudo -H apt-get install ros-melodic-catkin
  sudo -H apt-get install ros-melodic-vision-opencv
  sudo -H apt-get install ros-melodic-perception-pcl
  sudo -H apt-get install ros-melodic-laser-pipeline
  sudo -H apt-get install ros-melodic-image-pipeline

On a whim I have tried to change the dependencies to <depend> without luck.

Additional info:

• Ubuntu 18.04

• ROS melodic

All help appreciated.