some thoughts or questions I'd have are...
is this a private seller, or at a dealer?
if at a dealer, it's fair to say, that even if it's a "deal," they're making a profit out of it.
As far as player/ silent system, you ultimately are paying a premium that you don't have a premium interest for. It kind of reminds me when my wife was interested in a Bosendorfer 200. She loved the tone of one, that had a butterfly/ dragonfly artwork. Yet she cared almost 0% about the artwork itself, and only cared for the piano. So we got a normal ebony finish piano. We couldn't justifying paying a huge markup for something we didn't care for.
Also, consider how difficult a resell could be. for example, imagine you buy it. 5 years later you want to sell it. a potential buyer, such as myself (as I love Shigeru's tone), sees it listed for sale. When I learn that it has the player/ silent system, I would consider it a con, as I would-- even if errantly-- think that your selling price to me is factoring that same system, and I'd rechannel my focus towards the "regular" Shigeru grands. And 10 years later, someone may consider that system completely outdated, and associated your Shigeru with "it's a really old piano, and the system is so antiquated."
I have a similar opinion when I saw a Steinway Model B with the (in my opinion) absurdly overpriced Spirio system. And if I were seeking a Yamaha CFX, or Yamaha S7X for example, I would steer away from any that have a Disklavier/ Enspire system.
At the end of the day, there's a reason this piano you're referencing is at the price point it is. The deal or "deal" is priced according to the market demand for it. Otherwise it likely would've been snatched up long ago 🙂