Yeah, how ignorant are these people who don't know fake news.
The East-West Schism was a separation of what became the two churches. Each side did the same thing to the other side. They mutually excommunicated each other. Rome claimed papal supremacy, but it wasn't accepted throughout the Christian world at that time. So, to suggest that Orthodoxy left Catholicism is wrong. They just split, each going their own way, based on different teachings that had changed over 1,000 years. The Church in Rome did not control Constantinople.
The funniest part is this:
East–West Schism - Wikipedia
"In 1053
Leo of Ohrid, at the instigation, according to
J. B. Bury, of Patriarch
Michael Cerularius of Constantinople,
[138] wrote to Bishop John of Trani "
Yep, the Catholic side had a Bishop called "John of Trani", so, we know what the Catholics were getting up to even in 1054.