That idea stopped and has never been made public again. Why?
Data on transfers between publicly funded schools is hard to find. Here is a report on Washington DC from 2015 that is very similar to what I think Dallas County would look like: https://www.washingtonpost.com/local/education/thousands-move-in-and-out-of-schools-during-the-year-creating-disruptions/2015/07/04/43b63c02-14f9-11e5-89f3-61410da94eb1_story.html?utm_term=.51212dcc6104
Yes, DISD is looking good. Parents need to be studying TAPR reports on schools they are considering before they enroll or transfer their child.