Yeah, attacking a military unit seems like an act of war to me. Pretty blatant. Demonstrates that China only behaves as a bad actor with its neighbors, and can’t be trusted to be anything other than a bully.
This is basically China daring the US to do something about it. We shouldn’t take the dare, but we should respond with a show of support for the Philippines. China is flexing because they think the US is too busy with Ukraine, Israel, and the upcoming election.