This is correct. I looked into this a bit so as to know what exactly I could do without being banned ( ) and "curving" around objects is allowed, however it is against the server rules to simply poke a pike (or longspear) through a solid object (other than players) and release. For example, aiming through a doorway, releasing the thrust, and then turning into the wall beside the door to stab people hiding around it is allowed, however running up to a solid wall and just thrusting through it is NOT allowed.
I have to say that this intepretation being discussed is silly.
So you can't poke someone STRAIGHT through an object, but if you go STRAIGHT through the object and then TURN before you hit your enemy, it is OKAY?
Give me the space coordinates to the planet where this makes sense.
I can just hear the gripes now.
"You exploited"
"No I didn't, I glitched!"
"You poked straight through an object"
"No I didnt, I turned!"