N's 'truth' is a lie, Ghetsis raised him on lies.
Sure he thinks it the truth, but it's literally not, Reshiram would know it isn't so I find it hard to believe it would support him.
The entire game N goes around Unova seeing everything, especially the player character, blow his shit out, but he sticks to it, he sees the world not matching what he believes but he chooses to stick to it.
You're telling me that isn't a man who strongly believes in ideals? You're telling me the man who willfully ignores the truth before his eyes, who's entire character arc ends with the main characters showing him the truth isn't what he thinks it is should represent truth over ideals?