According to CCRM, the only thing that's different is that they think they rule more embryos as "normal" than other labs like Igenomix. They said some labs have as many as 20-40% mosaic, while theirs is closer to the real-life mosaicism figure that's about 1-3%?
So basically they think other labs dismiss potentially good embryos out of an overabundance of caution.
You can read more here:
https://www.ccrmivf.com/news-events/ccrm-lowest-chromosomal-mosaicism-rates-usa/