Then you're not actually reading the timeline. AI is not a Scotsman. I am looking at the well known sub-field of computer science known as Artificial Intelligence. I am not the first to observe that anything from that field, once working well is no longer commonly considered to be AI.
1965 Edward Feigenbaum initiated Dendral, a ten-year effort to develop software to deduce the molecular structure of organic compounds using scientific instrument data. It was the first expert system.
Go ahead, look those guys up. Expert systems were very much considered AI when they were invented in 1965. By the '80s they actually worked and were no longer considered AI. Playing checkers USED to be thought of as AI. Not any more, probably because it works well and can be found in a child's toy.
We will never know if a computer has achieved what you call 'true AI' we can only observe it's behavior and guess. Certainly I have met people that lead me to wonder in the other direction. Philosophers have questioned our ability to know if sentience exists at all for that matter.
If you give it some thought, you'll realize that you don't actually have a good testable definition of what you consider 'real AI' at all. If I'm wrong, write that paper now, your Nobel awaits!
I suspect though, that you simply lack perspective. There was a time when grown adults commonly believed computers were thinking simply because someone (not them, of course, it took a high level wizard) could type something to the computer and it would type back an appropriate response. The field of AI had somewhat higher standards.