What does 2 Chronicles 28:20 mean?

Tiglath-Pileser, king of Assyria, came to Ahaz, but instead of helping, he made things worse for him. 2 Chronicles 28:20 - Modern Text Bible

(Ahaz’s plan backfires. The Assyrian king doesn’t help; he just adds to Ahaz’s problems, showing that trusting foreign powers instead of God leads to disappointment.)