I second the question. At Juniors I saw a number of kyungos called for an infraction that occurred immediately after scoring, but do not recall seeing the point invalidated.
Back in February at NCTA Nationals I was center for a match where a competitor scored a turning kick and immediately landed in a clinch with obvious holding of the hogu straps. The other competitor then struggled trying to get free. I invalidated the point and called a kyungo on the kicker. The coach immediately began protesting that the infraction occurred after the kick scored, so the point should stand. He was ok with the kyungo. The TA called me up to the table and essentially said the same thing. I deferred to the TA and reversed the invalidation of the point and continued the match.
Seems like invalidating the point would be acceptable, however, under the rule noted by Jeannette. The intent of the infraction was to prevent the counter from happening.
Also, could we reasonably add pushing to "holding, clinching, stepping on, or kicking the opponent's leg, etc"? That would seem to fall under the "etc".