Eh, I don't think Ludicrous is added by default into all performance cars. It is a retrofit that they were kind enough to offer as a 5k upgrade to current owners, but there are actual parts that make that work, it isn't just a software limitation. My guess would be that right after they released this, they made a bunch of fully optioned show cars in order to let people test drive the new features. I know our store has a fully spec'd P90DL. It is likely just time to cycle that inventory if that car was made back in June or so...
I thought the discussion here on the forum was leaning towards all 90 kWh batteries having the hardware aspects of Ludicrous mode in them already. If so, it's just a software switch they could flip when they go to sell it.
OTOH, it's true that most of the P90Ds they'd order for demonstraters would benefit from having Ludicrous mode so they could show it off to potential customers, and this might just be a reflection of that.
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Hopefully they start dropping the prices on those inventory ones. I tried spec'ing out a couple they had and it was extremely close to building a new one (within hundreds of dollars).
Tesla has a consistent formula for how they discount prices on loaners - I think it's something like a dollar per mile and a thousand per month.
While I'd love to buy a car for less money, there's no incentive for them to drop the prices since they are clearly getting plenty of turnover as it stands, especially from gotta have it now impulse buys.