I have given him the land of Egypt for his labour wherewith he served against it, because they wrought for me, saith the Lord GOD.
The timing matters greatly: sixteen years pass between the first word against Egypt and this one, while Nebuchadnezzar wears himself out thirteen years at Tyre. God uses that delay to ripen Egypt's weakness through their own wars, then rewards the king's costly labor with a land that falls easily into his hands as spoil.
AI summary
Commenting on Ezekiel 29:17-21
I have given him the land of Egypt for labour wherewith he served against it, That is, against Tyre; meaning not Nebuchadnezzar merely or only, but his army also, who did the main of the service and labour, and had the plunder of the country for it; though the kingdom itself was given to their king, and annexed to his monarchy: because they wrought for...
because they wrought for me--the Chaldeans, fulfilling My will as to Tyre (compare Jer 25:9).