It looks like that “Close Rikers” plan is a total non-starter, after all: Mayor Bill de Blasio has already rejected one of its core steps.

The report from former state Chief Judge Jonathan Lippmann’s blue-ribbon commission relies on cutting the city’s jail population in half — and says that will require decriminalizing a host of offenses, from prostitution to fare-beating.

City Hall won’t have it: “While we appreciate the intent of the commission,” said a mayoral spokeswoman, “these actions . . . could actually jeopardize public safety.”

De Blasio suggests other reforms will do far more to cut the jail population from 10,000 to 5,000, so he hasn’t technically abandoned ship — but he hasn’t embraced most of the report’s other suggestions, either.

And the mayor also was on record until last week as believing that closing Rikers is a “noble” though too expensive idea. But his fellow progressives demand progress.

Sure looks like de Blasio has changed his tune without changing his mind.