Most likely, since only the time lords knew about the War Doctor being "The Doctor" (he wasn't using the name since even he didn't count himself as "The Doctor"), and since almost no one knew about the "Meta-Crisis Doctor" that when they killed him, his enemies would expect a regeneration, so he had the Tesselecta produce the regeneration effect.
When it comes to him healing River in TATM, it's unlikely that time lords have EXACTLY enough regeneration energy for the 12 regenerations, and there is likely to be at least a little left over.
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