No. Concessions are something that happen before someone is taken out. Concessions are a negotiation between opposing forces. A taken out result is completely dictated by the opposing forces and should be potentially worse then the concession. Even if you hadn't taken any consequences Someone who took you out would be well within their right to say you're dead. If you concede that isn't usually the case.
Here is the relevant section:
Finally, a character cannot be saved from a
roll that takes him out by offering a concession.
You have to offer the concession before the roll
that takes out your character. Otherwise, it’s
cheating the opponent out of victory.
It might not have been perfectly worded, but what I meant to indicate is that if you award a 'taken out' result in a situation when instead taking a consequence (or several consequences, even) was and option, and sufficient to prevent it, then the 'taken out' result was
voluntary, as the individual with narrative control of that character
chose to allow it. Which is, fundamentally, a Concession.