Who is the owner of this bitcoin forum? Did Satoshi make this forum or was it a follower of his? Is there a reason why the website layout is "retro" and has stayed the same since the early 2010s? Not saying the layout is bad or anything I kinda like it ngl, it is a little bright though haha 
The design of the forum is the default layout of the Simple Machines forum software, the software which the forum is based on. It has not been changed ever since the forum was established. I don't think it ever will be changed, even when the new forum software is done (I believe from what I have read that the two will run hand in hand/alongside each other, I could be wrong about this though).