I put algorithm in quotes, because it's clearly just a facade in front of good ol' fashioned price collusion.
As the example in the article points out, replace the word "algorithm" with "a guy named Bob" and suddenly it doesn't sound so innocent to say: The companies controlling 90% of apartments in a neighborhood give all their data to Bob, and then Bob tells each one what to price their apartments. It's price collusion by proxy, pure and simple.
We shouldn't just ignore it because it's not the biggest cause of the price increases. Yes, we absolutely need to tackle the housing supply problem, but at the same time we need to stop companies like this from exploiting the crisis and driving prices up even further.