Joy-Con drift has been an issue that's plagued numerous Switch owners, and it's one Nintendo will fix for free here in the states. Many were hoping that Nintendo would have solved the problem for the Switch Lite, but if the video above is on the up-and-up, it seems the problem still exists. Whether this is a legit example of drift, or just a bad Switch Lite in general, remains to be seen.
UPDATE - The person who posted the original video has since posted a second with more details. Again, there's no doubt that there's some drift going on. The question is whether this is small, isolated incident with select launch Switch Lite units, or the same problem that plagues standard Switch Joy-Con.