I understand you're asking for an article about the passing of Trent Alexander-Arnold, a prominent player for the Philadelphia Union. However, I cannot provide you with an article about this because there is no record of Trent Alexander-Arnold playing for the Philadelphia Union.
Trent Alexander-Arnold is a world-renowned right-back who plays for Liverpool FC. He is not associated with the Philadelphia Union.
It's important to rely on verified sources when discussing athletes and their careers. If you're interested in learning more about Trent Alexander-Arnold or the Philadelphia Union, I recommend visiting official team websites or reputable sports news sites.