They've reported on the switch to the 'new Bolivar' [1], which has an official conversion to the Petro. So the Venezuelan government might well just now be switching to issuing new Bolivars, and reporting their value in Petros (I can't say why this would make any particular sense, except perhaps to make the distinction from old Bolivars clear).

[1] https://www.ft.com/content/7e19a908-a48c-11e8-8ecf-a7ae1beff...