The CertSimple article completely ignores CPU and memory usage. That is where Brotli can become completely unacceptable for dynamic compression – it uses vastly more CPU and RAM than gzip.

Brotli is fine if you can precompress static files on a prep server or desktop.

It's unprofessional and unscientific to evaluate compression codecs without measuring how much CPU and memory they use. Brotli is a disappointment, coming 20 years after gzip. In 20 years we should expect something better than Brotli, something that is better optimized for modern CPUs, vectorized by default, and with a much better dictionary.