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It's definitely 100x (or 100.73x) as shown in the screenshot, which represents a 9973% speedup - the article text incorrectly uses percentage notation in some places.

The article probably contains traces of blue.

What does this mean?

https://news.ycombinator.com/item?id=44627072

100x to the single function 100% (2x) to the whole filter

The ffmpeg folks are claiming 100x not 100%. Article probably has a typo

That would be quite the percentage difference with 100x

I'd guess the function operates of 8 bit values judging from the name. If the previous implementation was scalar, a double-pumped AVX512 implementation can process 128 elements at a time, making the 100x speedup plausible.