The table seems wrong. Xterm supports sixels.
You can fix that with a pull request to ucs-detect; for example: https://news.ycombinator.com/item?id=45801452
Only if run with `-ti 340` argument. So in general, it's not there.
You can fix that with a pull request to ucs-detect; for example: https://news.ycombinator.com/item?id=45801452