If you passed the IR/last sim then you clearly have at least basic instrument skills.
Not necessarily so. Most instrument rating tests are conducted with automatics firmly engaged and the fore-finger of the PNF jabbing away on your behalf at the CDU. All the PF has to do is keep the FD needles in the centre and the automatics do that on your behalf, too. One raw data instrument approach does not make constitude keeping up basic skills.