Most people who use “From the river to the sea, Palestine will be free” use it as a plea for peace - not violence. But ignorant and hateful politicians just ignore the context as it doesn’t fit their narrative.
You probably were banned due to linking the article that had the quote that called for peace in the first line.
“We won’t rest until we have justice, until all people, Israelis and Palestinians, between the river and the sea can live in peaceful liberty,” said Andy McDonald, a Labour MP, at a protest in London organised by the Palestine Solidarity Campaign.
Like I said, peace doesn’t fit most people’s narrative.