This isn’t a protest, it’s an open letter, and it’s at a games event. Most people will ignore it, and those that don’t will likely forget it happened five minutes later. It’s not going to reach anyone in a position of power to change anything, so it’s merely virtue signaling since media orgs will report on it after the fact.
If you want to protest, do it in public. Organize at state/province and national capitols, organize at universities, wear Palestinian clothes in public, fly flags, etc. Asking a games event organizer to read an open letter will do absolutely nothing, but maybe some virtue signaling for whatever political party uses the same talking points. If you want real change, be noisy in public, run for office, etc, open letters do nothing.