"One is obviously wrong"
One is obviously wrong?
They could, of course, both be right. It could mean: the day on which I'm telling you is today, and it could mean: the day that I'll see you in paradise is also today.
The second option is far more enlightening as it provides information on when Christ will see the person in paradise. The first option states that which is blatantly obvious and hence superfluous, and hence the less likely of the options.
Anyway the ambiguity is not a solid foundation on which to construct the details of a doctrine.