And even if it is, you have a kasha on that; it doesn’t change halacha.
Which is why the Brisker Mehalech avoids at all costs a Machloykes in Metzius.
In fact, the question is asked (for example, by Yesh B’Gidin Nosen Ta’am) why not go out and check the Metzius? And the answer is not “That’s the halacha, you have a Kasha” 🙂