Hendrik_2000
Lieutenant General
At least from public sources, the Chinese electromagnetic gun prototype was a coil gun. You can check out the barrel is circular not rectangular.
A coil gun faces other technical difficulties but the projectile is not touching the barrel; it is literally floating in the air. This reduces the worries on barrel durability. In a rail gun the current must run through the container of the projectile. In a coilgun there is no need for this container.
Due to language issues, the English sources only talked about "railgun", but were not clear if it is pure electromagnetic, or chemistry-assisted. The Chinese sources only talk about "electromagnetic gun", but offered no details if it is a rail gun or a coil gun. Maybe the two Navies are taking on different path this time.
I don't think you can use a very old test bed to draw conclusion on the gun that is now tested wait and see