Yes, I know, but that's not what the quoted reddit comment claims:
> To the absolute limit of our ability to measure it ... when an object is dropped, it begins falling instantaneously. ...This is fairly earthshaking, really. Because it implies that somehow a "signal" of some kind is getting from the ground to Wile E. faster than the speed of light. Which is supposed to be impossible.
There is no contradiction. The thing you quoted is what happens in normal circumstances (i.e. linear motion) - you instantly start falling with no delay. Which is correct. It's the change in the linear motion that gets propagated at speed of light. But in any case you still react properly because things cancel. Woo!
> To the absolute limit of our ability to measure it ... when an object is dropped, it begins falling instantaneously. ...This is fairly earthshaking, really. Because it implies that somehow a "signal" of some kind is getting from the ground to Wile E. faster than the speed of light. Which is supposed to be impossible.