Some British higher-ups hate the color orange. This has lead to the banning of orange In certain British companies from equipment to uniforms.
I’m assuming Matchroom is following suit with this design that they requested. According to the commentary in the first match, Ms. Frazier mentioned that the change was final and the players would have to step into modern times and adjust.
The Society of United Irishmen was formed by liberal Presbyterians and Anglicans in Belfast in 1791. It sought reform of the Irish Parliament, Catholic Emancipation and the repeal of the Penal Laws. By the time the Orange Order was formed, the United Irishmen had become a revolutionary group advocating an independent Irish republic that would "Unite Catholic, Protestant and Dissenter".
https://en.m.wikipedia.org/wiki/Orange_Order
I always assumed this was why there is no orange ball in snooker.
With orange being a spectrum of light color, there is no physical/logical reason to eliminate it from the game of pool.
https://billiards.colostate.edu/bd_articles/2017/may17.pdf