Yes-- that guard was actually never supposed to allow intruders past. We had to have a strict talking to him before this latest patch and now he's promised us that no one will be getting through as easily as in the past. You're going to have to find the intended way to gain access to that upper area from now on... as it was originally designed. But don't worry about that just yet. That's for later. I'll update the devlog to indicate that change as well in the event others were sneaking past that lazy guard.
There is an object you have which might resemble a UAP... no? Maybe you could use that...
And don't get too violent with that crowbar! :D I'll check out the instance of crowbar-crashing you mentioned.