I think you've confused Zstd (which they were not discussing) for Zlib (the primary implementation of DEFLATE, which is most commonly used by Gzip)
Gzip/DEFLATE is mediocre on most metrics relevant to compression but it's widely used of course. Zstd is better all-around, but much newer and thus doesn't have the same level of adoption.
Gzip/DEFLATE is mediocre on most metrics relevant to compression but it's widely used of course. Zstd is better all-around, but much newer and thus doesn't have the same level of adoption.