Removing metadata like function names to make the binary harder to read. Control Flow Flattening:

: Breaks the logical structure of a program into a "flat" mess, making it nearly impossible to follow the software's "if-then" logic. Anti-Tamper Triggers

The phrase " obfuscate 021 upd " does not appear to refer to a single well-known technical release or public post. Based on search patterns and available documentation, it most likely refers to one of the following contexts: 1. Obfuscate Minecraft Mod Update " is a popular Minecraft library mod created by MrCrayfish