Due to their original design and the use of Objective C, yes.
Their screening process consists of scanning code for using "undocumented" system calls that are restricted for Apple's use only.
Obfuscate those system call strings and you have now bypassed the screening process (ala: XcodeGhost)
Too bad they can't stop it, until they move every app to Swift (now you know why they created a new language).
Even if they could crack every system call string alteration an app could do, the app could request the system call string from a server, and execute it on the fly and get around the scan.
There is probably more to the screening process, but I am doubting there is much more to it.