No it doesn't...which is my point: why do some here seek to say that the capital punishment bit still applies today but not the eating of meat-with-blood-in-it bit? That smacks of selection, methinks. If you say that Gen 9 is still 'good law today' (as we in the law would say) then to be consistent, you should give up eating that rare steak as well as support CP.
I suppose the argument can be advanced that Gen 9 permits capital punishment for murder.
But (a) mercy is better than justice, and we can be Christlike by extending mercy
and (b) as others have said we can never be quite sure we've got the right convict and you can't undo an execution. So seeing as we are living in reasonably settled and non-violent cultures with the ability to lock people up rather than do away with them, its better that we do that & not risk killing the wrong person. If we were still living in little tribes in the desert, things might be different.
[ETA - cross-posted with PL, to whom I reply: if Gen 9 is universally mandated, then what about the meat issue in the same passage?]