Sitchin was a fraud, if that’s what you’re asking.
If he was, he was a highly educated fraud and a lot of archeologists still use him for reference. He may not have been right on some things but on many things he was and still is. Aside from that he was not the only one who speculated about the 3600 year cycle, as Immanuel Velikovsky also made a pretty well documented case for it. But to each his own as we are still entitled to our own opinions. Take care and have a great day!