I do not agree that MPD walked that back. What MPD did is change the language to be more nuanced because people were misunderstanding the original. They never claimed with certainty that the perp is not a threat to the public, because that is obviously unknowable. Early and current official statements are in agreement: (1) MPD believes the murders were targeted (2) they do not believe any others will be targeted. Their rationale is [appropriately, imo] not public.
Below is what the MPD FAQ says today. The second sentence ('However') contrasts the first, i.e. MPD does not believe there is a serious threat to the general public. No walk back.
Is the public in danger?
Anytime there is a crime against a person, there is a potential danger to the general public. However, detectives believe these murders were targeted. As always, stay vigilant and look out for one another.