It think you are being highly optimistic with regards to the S1000. None has been built yet, and it was originally a joint venture between the Russians and Italians. With the Italians since then having gone alone and substantially changing the design.
Understand where you're coming from, the original S1000 did start as a joint venture, but the current version is effectively a clean-sheet Italian design, built on Fincantieri’s experience with proven platforms like the Todaro-class.
That said, I don't think it's overly optimistic to consider this a serious candidate for PN’s next acquisition. Multiple credible indications suggest the deal is in advanced stages, and historically, once PN locks onto a platform, progress tends to follow a fairly standard cycle, contract signing, construction, sea trials, and induction.
So, while the S1000 hasn’t been built yet, the combination of a matured design base and strong buyer interest makes this more than just speculative at this point.