I'm unaware if the numbers include Lexus sales numbers.
I think the point is the supply will indeed get extremely low and the item, both the FJ80 and the FZJ80 will become extremely rare (at least those stock to semi-stock and in decent shape with decent miles) in the coming years.
The difference between the LC and cars like Gremlins & Pintos includes the understanding that the LC is almost universally a respected vehicle compared to those models of cars and trucks that don't have the cachet or were considered low quality or inferior vehicles during their entire history. Additionally, we have seen the collector's market almost always be enthralled with 'trucks' and other off road vehicles that manage to survive intact and in good shape. It helps with the value of even non-collector's item trucks and jeeps as well.
My opinion would be, unbiased between the FJ80 and FZJ80, that in the coming years, due to the great market of interest and cult following they have always held, that as at the original low sales numbers become more and more scarce, with the reputation the LC has always had as a top notch quality vehicle, and the fact it has changed somewhat after 1997 to a more road friendly luxury car, that there will indeed be a premium attached to their value.
My curiosity comes from wanting to simply understand that if only 16,311 vehicles were sold 22-24 years ago, knowing the normal rate of attrition for vehicles being wrecked, totaled out, parted out, etc, what IS the real estimated number out there on the road? I would guess at least 20% were wrecked over the past 2.5 decade, another 10% just simply worn out, another 10% parked somewhere and forgotten about or parted out, and maybe 20% modified or abused in such a way to maximize the rarity of finding a nice original stock example. That would indicate that the FJ80 only has about 6,524 examples in operation, and maybe 10% of those are extremely worthy specimens, meaning there might be less than 1,000 FJ80's you could find that don't need restoration and less than 2,500 FZJ80's.