Yeah, totally untrue. I *wish* all Land Raiders got that.
Good rule of thumb: if an opponent tries to pull something that sounds fishy, ask them to produce the rule (in writing). If they can't, then that's not a rule.
There probably is a way you can get Armored Ceramite on some kind of Land Raiders somewhere in some list, but I'm 100% sure this isn't standard equipment or available on all Land Raiders everywhere.