No, they aren’t back just yet.

This post is dedicated to everyone seeking for some information about the current state of these works who have been on a hiatus since 2003.

I took the liberty to e-mail Kadokawa inquiring them about X and Gouhou Drug, and here’s their answer:

Thank you for having supporter our company’s publications.

As you indicated, the series “X” and “Gouhou Drug” have not been published since 2003. We have periodically discussed the resumption of their serialization with the authors.

However, because they are currently working on so many series, the authors have expressed that their intent is to wait until their schedules become more flexible before planning the resumption of the serializations. It will still be a while before the series can recommence.

There is also the question of what magazine to publish them in.
We apologize for making you wait, but please bear with us for a while longer.

Translation thanks to usomitai-san ^^

Cut for original reply in japanese