The benchmark is very rudimentary. It does not test different levels/settings apart from its own -b 256/512 (does it affect decompression?), it doesn't measure compression time and memory usage. It does not specify parallel vs single-threaded (it mentions parallel on the one decoding number but what about the others?).

The lrzip test is interesting but it omits for example zstd and doesn't even have (de-)compression timings.

A lot more numbers are needed to present a fair and informative comparison.

I don't want this to be a swipe against bzip3, I only want to point out the presented benchmarks could be a lot better.