Maybe this is a contrarian perspective, but I think "Owl's Birthday" is more effective with Mogg saying "do" instead of "rape." The former is more ominous because it's deliberately unclear, and it works better with Owl's confused reaction. He doesn't immediately grasp what Mogg is talking about, whereas saying "rape" is a tad blatant. Leaving it vague makes the ensuing horror and comedy more unexpected and shocking.
It's not like Hanselmann changed it to make it less offensive or whatever, considering that Owl still gets sexually assaulted as a prank. This was clearly a creative descision, given that Hanselmann has made it clear before that he doesn't give a shit about public pressure from twats on social media.