Right, I stated that in the post #393, not sure why you are repeating it. This does nothing to support you opinion.
However, you will find no Hebrew word for "THE Assyrian" in Isaiah 14:25 or Isaiah 10:24-25. You will only find the Hebrew word for simply "Assyria".
As we can see from scripture God has used personal pronouns to describe nations:
In Jeremiah 3:7-8, a personal pronoun is used 6 times to describe Israel.
Jeremiah 3:7-8 I thought that after
she had done all these things,
she would return to Me. But
she did not return, and
her unfaithful sister Judah saw it. Because faithless Israel had committed adultery, I gave
her a certificate of divorce and sent
her away.
Unless you believe God was talking about a single person in Israel?
Notice at the end "their destruction". It's a feminine singular construct used in a masculine PLURAL sense for Assyria
Isaiah 10:24-25 Therefore thus says the Lord God of hosts: “O my people, who dwell in Zion, be not afraid of Assyria when he strikes with the rod and lifts up his staff against you as the Egyptians did. For in a very little while my fury will come to an end, and my anger will be directed to
their destruction.