Okay, that is one down. You've got to get through literally all the rest of the engineers and professionals. At some point, you'll hit the engineers at NASA that were working on this problem before SpaceX existed.
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.
You're saying every engineer and every person with any other type of profession you've ever spoken with, said that it was impossible to land a rocket? I feel like plenty of professionals don't even have an opinion on the matter.
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.
If we wanted to be more accurate, we could say that less than 0.00001% of all engineers and professionals told elmu that it was impossible to land a rocket.
That seems less impressive than saying 100%, doesn't it? But hey, this is hacker news, not a math exam, and 100% is pretty much < 0.00001%, lol.
https://www.youtube.com/watch?v=W676Kk9LSYw