Epilogue: The very next day, I was supposed to fly back home. Everything was in lockdown, due to the COVID-19 outbreak. There was confusion about whether or not I was permitted to fly home. (I did get to fly home, but it distracted us all from the shitpost!)
In October 2022, I flew back out there for some presentations. When I stopped by the Cryptography team's offices, I looked at the whiteboard and, lo and behold, my dumb shitpost was preserved for nearly 3 years.