That is a completely false statement. The United States government has specifically stated that there is no suspicion at all that Osama Bin Laden was in any way connected to the 1993 World Trade Center attacks. Your link doesn't provide any proof at all to back up that statement. Remember just because you read it on the internet doesn't make it true. What is true is that some other people, who later became members of Al Qaeda, were in fact vaguely connected to a small amount of the financing of the 1993 WTC bombing, and that some relatives of the perpetrators of WTC 1993 bombing later became members of Al Qaeda. But that does not point to any direct connection at all between Osama Bin Laden and the 1993 bombing.