This is the correct approach. Homeschoolers started the battle against government-school political indoctrination by simply opting out. They are brave pioneers but the war does not end with homeschooling. Until the government schools feel the pressure to actually educate children -- instead of just abusing their position of trust and taking it as an opportunity to implement Marxist brainwashing -- they will continue doing what they're doing, and they will largely succeed. So the seed of resistance that began with homeschooling must sprout into material resistance against the corruption within government-school education.
Eventually, the goal is to see all government-schools shuttered and replaced with private education where the demands of customers (parents & students) are served by educators who are producing a product that actually benefits their customers, rather than ivory-tower monopolists ordering parents & students to sit down, shut up, and think what they're told to think. But the absolute worst place to fight this battle is in the legislature. The legislature understands nothing about education and the problems of government education monopoly. Legislatures are staffed by elected politicians who only understand one currency: votes. They will support whatever policy gets them re-elected, no matter how braindead it is. Love it or hate it, that's what representative government means. So we shouldn't be shocked when leftist policies get enacted in our schools because the Left has brainwashed the public through mass media to believe these policies are "inclusive" "enlightened" and "non-bigoted."
I have seen videos of street protest tactics being deployed in school board meetings and this has no future, no possibility of success whatsoever. You will change nothing using these kinds of braindead street tactics. The only way to change the school boards is to make the board members feel the potential liability for their decisions -- both legal and in the court of popular opinion. And the only way to make them feel the heat of potential liability is to engage their decision-making processes at the procedural level, which is exactly what is happening in the OP video. Of course, we also need a network of legal support and even political support. It's an interlocking system, just like the interlocking system that the radical Left constructed a century ago in order to take over American culture from within and impose Progressivism through generations of indoctrination. But don't think for a moment there are any quick-and-easy solutions to our current quandary. Applied elbow-grease is the only real solution. If American conservatives really practice the traditional values they preach, then this should be no sweat... just put in the leg work, and let's get this done!