I agree with this. A mistaken word spoken is not a lie. That is why a lie is something that must be be communicated with verve.
Of course, it can be a mistake on the part of the speaker, but he communicates it with power as though it is the undeniable truth,
then it enters the class of The Lie.
If I go out saying I am going to the store, but what I really intend to do is go get a beer, that is a lie.
If I get my beer and then pop into the store real quick so that I was there, it is still a lie.
If I don't go to the store, but I said I did, when I return, if the person is still there, I will say I didn't go,
before he asks me, "how was the store?"