The article you linked is specifically about latency. There are other factors that contribute to overall terminal experience such as high frame rate and high throughput. Once latency reaches a "good enough" level, it becomes a non issue, and frame rate and throughput remain. Alacritty excels in those areas (there's even a table in that article demonstrating Alacritty's high throughput).
There is also a plan[1] for making Alacritty's latency best-in-class.
There is also a plan[1] for making Alacritty's latency best-in-class.
[1]: https://github.com/jwilm/alacritty/issues/673