Sometimes the intact altar is on loan – this one appears to be a “destroyed altar”
Now Solomon loved the LORD, walking in the statutes of his father David, except he sacrificed and burned incense on the high places 1 Kings 3:3
Unlike a “Biblical” altar:
Exodus 27:2 And thou shalt make the horns of it upon the four corners thereof: his horns shall be of the same: and thou shalt overlay it with brass.
God did not want altars everywhere, only in Jerusalem – and Sennacherib noticed Hezekiah took away the bad altars and destroyed them like this one.
2 Kings 18:22 But if ye say unto me, We trust in the Lord our God: is not that he, whose high places and whose altars Hezekiah hath taken away, and hath said to Judah and Jerusalem, Ye shall worship before this altar in Jerusalem?