So, none of our weekly PTs directly say that your post has to be on topic. Does that mean if I write 200 words off topic that I should still be awarded the tpe? No, because that would be dumb. I don't see how this is any different. Clearly, the 1 tpe was meant for those who wrote less than 100 words and, like all PTs, stayed on topic in their writing.
If we're going to give back the 1 tpe to the users who failed to stay on topic because it wasn't very clearly spelled out to them that doing so would result in 0 tpe, then we need to give back all the tpe to all the users in the past who didn't stay on topic in their PTs because it wasn't clearly spelled out on those. Yet no one would seriously think that was justified. Why? Because the whole point of a PT is to stay on topic.
If we're going to give back the 1 tpe to the users who failed to stay on topic because it wasn't very clearly spelled out to them that doing so would result in 0 tpe, then we need to give back all the tpe to all the users in the past who didn't stay on topic in their PTs because it wasn't clearly spelled out on those. Yet no one would seriously think that was justified. Why? Because the whole point of a PT is to stay on topic.