I couldn't find this by name, but i suspect it's half empty or overly regular. As i planned to make a compressor for an arbitrary rectangular area and the decompressor was big enough already, i never optimized for "lighter" screens (and RLE is only for attributes). On a big selection of screens LgK is usually much better (hundreds of bytes) for about 90% and very close (maybe a bit worse) for the rest.
Theres are also a few pathological cases (see R-Tape's avatar here or a low-res imitation like Alien Syndrome)) with much worse ratios compared to "byte compressors", the result of very limited number of unique bytes for most of the screen area and less (if any) correlation between the adjacent pixels.
Also pics with less regular dithering (like Floyd-Steinberg) may go either way, but usually the chunky method is good enough. .