וַיַּ֥עַשׂ הָרַ֖ע בְּעֵינֵ֣י יְהוָ֑ה כְּכֹ֥ל אֲשֶׁר־עָשָׂ֖ה אָבִֽיו׃
Und er tat das, was in den Augen des HERRN böse war, nach allem, was sein Vater getan hatte.
Metzudat David on II Kings
He awoken the hearts of the armies of the Chaldeans etc..., so that they will bring war to Judah.
Metzudat David on II Kings
According to the [extended] timespan of the events, therefore it went back and said "He sent them", for this was typical (grammar) for scriptures.