Colouring out of ‘ls’ is ls's job, not zsh's. There are different ls
implementations out there, and we won't maintain colour schemes neither
for all of them nor for just one.
On GNU systems, you may want to take a look at dircolors(1).
Currently, many different archive formats are colored red on by /usr/bin/ls.
There are several that are not picked-up by the code should be added, their file
extensions include:
.tar.lrz
.lrz
.tar.lz4
.lz4