I recall there being something posted that they had to tweak the timings due to HDMI bandwidth. However, that doesn’t really make sense because HDMI 2.1 should have more than enough bandwidth.
The only way it makes any sense is if they were working with a limited HDMI bandwidth, such as those available on the PS5 or XSX. But they can’t do more than 120Hz.
Maybe Eve need to revisit the need for custom timings.