> Is he a liar?

Yes, he's quote mining to try and argue that there was some sort of confusion about the implications of the amendment. This was part of the debate about the amendment and whether or not it should be reworded. In other words, Howard and Trumbull were raising the very issues with the text that Thomas wants to take issue with.

That discussion was one which shows that the implications of the text were understood and accepted as a result of debate. It cuts against Thomas's actual argument.

Thomas is a liar. Or at very least a dishonest in his characterization.