I don't think the naysayers think they are smarter than Musk and know better than he does... they're just pointing out that Musk has promised "Full Self Driving" or "RoboTaxis" to be right around the corner for years and years now.
My prediction is that before 8/8 there will be an announcement of some kind of delay or it will be like the CyberTruck announcement where the actual production vehicle is still 4 years away... but I guess we'll see if history repeats or if Musk comes through with his promise.

