Well, I think so, but J. Herbin is now the second company selling it of which I’m aware. My greater issue is that this article mentions flushing with hot water. I would caution to not use anything more extreme than lukewarm.
J. Herbin fountain pen cleaning solution
I far too frequently let ink dry inside one of my treasured pens. When simply flushing with hot water won’t clear them, I use this cleaning solution.
Simply draw some solution into the pen as you normally would ink. Shake it around and then let sit for 5-10 minutes. Flush the pen out several times with warm water, and you are back to an evenly flowing pen.
A good practice is to run warm water through the pen between fill ups. I often forget.