I think most of these were removed on 9/1, then added back. At least, on 9/1 a huge mass of cars was removed, then today a huge mass, roughly equal in size was added. There are a lot more lower spec cars than before. Maybe a rebalancing of the loaner fleet?
There also are no "discounts" on these added demo cars, see
this post.
EDIT:
This, BTW, is not consistent with the reports from the Forum's VIN counting team, which over the last several weeks could be summarized as incoming orders narrowly not being able to support 2,000 units per week production rate.
If that would pan out, Tesla would be quite motivated to have sizable discounts to move these demo cars in Q3. Absence of discounts, of course, does not support this narrative.
Given Elon's email, which essentially indicated that Tesla tracking to be non-GAAP profitable in Q3, and possibly, with an additional effort, could even be GAAP profitable *and* cash flow positive, it is clear that Tesla does not have any demand problem to meet these excellent financial results.
This also puts into question conclusions advocated by the Forum's demand skeptics team that "huge discounts" on the classic nose coned cars were indication of the weak demand for Model S. These "discounts", as was discussed multiple times, were rather representative of the market conditions for obsolense instead.