This comment is phrased as if the article is confirming these points when it either doesn't mention them or even directly refutes them. First there is no mention of either crime or rent control in the article. But more importantly, it states that "A key piece of Austin’s strategy has been to encourage the construction of affordable housing." So why are you concluding that affordable housing isn't needed?
Affordable housing is the only type of housing that will ever be built. Builders aren't so stupid as to build products that their customers can't buy. Government intervention is not needed.
In this case affordable housing nets out as a way to overcome policy barriers to market rate housing. So it actually makes the market freer.
Many other implementations of affordable housing further raise the barrier and thus even if any is built it doesn’t help widespread housing affordability issues.
Rent control is just another flavor of housing affordability policy that often (always?) backfires.
Crime, social peace, and economic opportunity are very linked. A lot of house prices in urban areas are wildly distributed and often the increase cost is to buy distance and safety (often just a couple blocks) from high crime areas.
The comment is phrased in the greater context of the public discussion about housing, in general. Not the specific information of the article.
You know, like how a discussion about war might reference the various recent wars that everyone knows about; it's not limited to just the content of the article.