Real consideration here is that the large 6450 number did not appear as an irregular delivery count for Europe, USA (only the insideevs.com estimate) and we have no idea about China/HongKong other than what Jose does with ev-sales.blogspot.com.
It is very strange that Jose's data was Model S only in 2016, and Model X only in 2017. He's estimating 624 Model X's in China for January, and then 50 for February. Model S averaged ~625/month in 2016.
Reading through Bertel Schmitt's writing is painful... for someone with so much experience reporting on the automotive industry, he takes quite a few liberties with his conclusions. In any case, he's been reportin on Tesla and China:
Here Is What We Know About Tesla's Big China Bonanza
He now admits that his data from JL Warren/JATO Dynamics is "not entirely correct." But what really is the problem is that he doesn't seem to understand the production and delivery rhythms. In any case, his data said that Tesla imported 2,680 vehicles in December and "sold" 3,144.
From his article:
Between January and December 2016, Tesla shipped 11,839 cars to China... Imports of new Tesla cars dropped to 1,067 in January, as Ms. Li told me.
Of course, 1,067 imported for a first month of a quarter is pretty good, higher than any first month of a quarter in 2016 (179, 247, 363, 605). So the normal expected overhang is likely in the 400-700 range. Let's just use the 605 number from Sept, 2016. So that's 1,440 overhang from December that wasn't registered, and then add to it 461 (1067-605) and that's 1,901. Given Musk's story from the January 4th Gigafactory investor's tour of about 2,000 vehicles that just missed delivery, that seems to check out. Normally, it is between the 2nd and early 3rd months of a quarter that should receive the bulk of shipments. Note in August, where 1,729 were imported, and 1,747 delivered the next month. Note that in Q4, 2,322 and then 2,680 in the last two months imported, and deliveries didn't quite flush it through.
Add to it that Hong Kong is expected to have a high quarter due to the expiration of FRT and slightly elevated early month numbers in Europe and U.S., and we have likely a draw down in the overhang.