Those US residents who dumped for tax filing reasons yesterday are probably buying back now it's lunch time on January the 2nd in the USA.
That makes no sense. Last year was a huge run up so you would not sell at the end of the year but sell this year if you want to defer paying taxes on it in the short term but even that isnt the most efficient. US taxpayer best case is long term capital gains which is 366 days from purchase so end of year or not doesnt matter.
Yup, artful bodger doesn't know what they are talking about. US Taxes also don't permit wash sales, which are selling at the end of the year and then buying back within 30 days. And even if they did, why would they sell to lock in gains??