What makes you think a simulation complex enough to be a universe would have familiar programming concepts? Would you expect that of alien tech a million years

What makes you think a simulation complex enough to be a universe would have familiar programming concepts? Would you expect that of alien tech a million years more advanced? Also, if our universe is a simulation, then we have no idea how faithful that simulation is to the world it runs inside of. Could be a lot different. Maybe our simulated physics is fanciful. Maybe the hardware it runs on is nothing like anything we're familiar with. And maybe the software is completely alien. To me it seems like the simulation argument is self-defeating, because you can't draw any conclusions about the real world from it in order to tell that it's actually a simulation.