What does Isaiah 36:7 mean?

'But if you say to me, “We trust in the Lord our God,” isn’t he the one whose high places and altars Hezekiah removed, saying to Judah and Jerusalem, “You must worship only at this altar”?' Isaiah 36:7 - Modern Text Bible

(He tries to confuse them about their own faith, suggesting Hezekiah’s reforms have actually angered God.)