**There is no “myth of the lost ten tribes”; that is Biblical and spoken of in the Bible.**
You mean like here:
“..So was Israel carried away out of their own land to Assyria unto this day.” 2Kings 17:23
The writer seems to know where the ten tribes were at that time.
And what happened after the Assyrian empire fell? That is not included in “to this day”, which was before Judah fell to the Chaldeans.