Earlier quoted context omitted.
Okay, but now we've gone from habitable to sufficiently Earth-like to meet an unspoken definition of Earth-like.
No, he really didn't - he said specifically, "So many, many things can be wrong and make a planet uninhabitable". What if Proxima B has chlorine in its atmosphere? Uninhabitable. Proxima B is a tidal-locked eyeball planet - what if the equatorial stable zone still shifts enough to not provide a stable environment for life? Uninhabitable. What if Proxima B encounters too much ionizing radiation? Uninhabitable. Use you…
You've also apparently not payed much attention to Sure, we don't know a whole lot more about it, so it is quite likely to not be a nice destination for humans, but it seems to be at least remotely Earth like. that I said above (surely my making that statement implies some use of my imagination prior to your suggesting it).