I don't play on this server, but I can clarify some things.
The target selected/random target will not show to everyone. As was examplified above. It shows it to those directly involved on either side of the attack, but not to everyone else.
Your reports posted earlier in the thread are incomplete, as they were parsed incorectly to travian-reports. However, it's plainly obvious that there is a message with "was selected target" in each of the reports. If the treasury was targetted, and the catas hit this target, the report will not say "was selected target" for that particular target choice. As said, the report is incomplete, but I'm guessing it hit the treasury, and thus there was no message about target selected for one of the two catapult targets, while the other target showed what was the intended hit, since it hit something else.
So your argumentation based on the reports alone is completely flawed. You have no proof in them. But yes, the event in itself is very unlikely - I will not comment on whether I think someone exploited a loophole for the UC or not.
In regards to the Wild server - it was never really clarified how it happened, most likely by chance, but it was actually in a way more unlikely than these two hits. The attacker only chose one target, and he chose complete random, which means that the chance was lower than if he had chosen a building.
Didn't see this brought up, so might as well point it out: if you target a building, it will only randomize between buildings and not fields. If you target fields, it will pick fields (That is, as long as there are buildings/fields aviable to randomize between). If you pick random target, it will randomize between both. So how many buildings you have also influences the chance.