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That is an interesting way of looking at the formation of a black hole.Rather than defining the event horizon by the amount of mass inside a given radius, you look at it as the escape velocity "to infinity".
Of course, this raises the question of an observer who is not "at infinity", but is only partway out of the gravitational well. Does this observer the event horizon as being the point where escape velocity to the observer's location would equal the speed of light? If so, would this event horizon would have a smaller radius than one seen by an observer "at infinity"?
Perhaps this could be partially resolved by looking at oscillations at the inner edge of the accretion disk, as this plasma is effectively an observer very close to the event horizon? These oscillations should be visible as short-term variation in the X-Ray output of a black hole's accretion disk.