re: Nope.
Assuming there was any real change in illumination because of the flare (and almost certainly there wasn't), a light echo would look very, very different than this. For one, given the time frame of the video, it would appear to be nearly instantaneous witht the flare itself -- not occuring hours afterwards, exactly when, by the by, the high-energy protons would be smacking into the CCD.
Cheers,
Nathan.