That wasn’t even remotely all my point. (Ayein b”Rush Limbaugh, demonstrating absurdity by being absurd.)
My point was that surely Rabbeinu Tam would also recognize that Rashi Tefillin are fine and kosher. Yes, using the expression Karkafta etc was over the top, but saying that Rabbeinu Tam held that his zaida Rashi was not yotzei tefillin his entire life b’shogeg is almost equally absurd!!
I have confidence that our dear friend Popa, whose own absurdity I was responding to, understood the point I was trying to make.