That's somewhat true, but also the vast majority of financing for Indivisible, who organized these protests, came from billionaires foundations. These protests would never have happened without them.
Indivisible "reports 73 percent of its funding came in the form of “major gifts” or from foundations. Additionally, it reports that one of its donors consisted of 23 percent of its funding", from https://www.influencewatch.org/non-profit/the-indivisible-project-indivisible
Besides all that, if a billionaire is backing it, it's sort of a sign that it's quite a centrist movement.
None of the senior Walton's have endorsed Trump, and the family has quite famously given money to both sides. I haven't found any Waltons condemning Christy over this, though maybe they wouldn't publicize it. I don't think it's a huge break from the family.