Earlier quoted context omitted.
I think it is? Like, this sounds like a pretty silly claim: > All engineers and other professionals told him that landing rockets is bullshit Where did you hear that?
Well I heard it myself from practically anybody up until 2015. I even attended quite a lot of conference talks on this topic... I'm sure it's not hard to find it online, famously a NASA director (I think?) did so.
Even if that's true, there's still every engineer and every other professional in the world you haven't spoken with. To take an example, I'm an engineer, I didn't say it. That disproves the claim.