Depends on how he means "Tesla killer". If he means, sells more volume, then it could be a while, obviously. In that regard, Tesla's kind of like a Toyota has been in the consumer ICE market, right? They're gonna be tough to overtake in selling relatively inexpensive consumer car EVs.
But if he means, producing high-end luxury model EVs, then Tesla was killed long enough ago that the body's no longer warm.
Once Porsche, Audi, and Mercedes started pumping out their actually luxurious luxury EVs, Tesla lost the money-is-no-object luxury car buyer EV market overnight. And those brands are selling at the kinds of ridiculous prices that they are (in)famous for. Huge profit margins, low production costs and effort. Show me the money!
Based on numerous reviews I've read, Tesla isn't really even playing in the true luxury market anyway, despite Tesla's marketing hype that says otherwise. Perusing car forums, plenty of wealthy folks bought Teslas initially because they were the only game in town and, what the heck, it's super cheap, so why not get one to play with, right?
Now those same folks from the forums are selling their Teslas and buying the luxury brand EVs. Specs be damned. Luxury doesn't show up on a spec sheet. You need to sit in something like a Mercedes GLS550 to understand luxury.