Earlier quoted context omitted.
By not allowing JITs, just like on iOS.
iOS allows JITs. This is exactly what I'm talking about. You're using bad or outdated second or third-hand info with no regard for the game of telephone involved in getting it to you, nor the anti-Apple zealots obfuscating the truth on its way.
What I do know is: if you try to use more intensive emulators like PPSSPP on a non-Jailbroken iOS device (via a developer account, enterprise cert, or similar), you will not get acceptable performance, because the emulator is forced to fall back into an interpreter mode.
Even on Jailbroken devices, the hacks required to make JIT work cause weird issues: https://github.com/hrydgard/ppsspp/issues/9186