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.
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.