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Okay, let's say you see that your opponent is using the SuperPack_Rus plugin. So what? Are you going to study the code before the game?
Then you'll have to force them to disable all plugins. But in any case, that's better than nothing.
But if we move away from the topic of plugins and consider cheating in general, are you protected in any way from, for example, your opponent editing resource TXT files? For example, SPTRAITS.txt or MOVEMENTS.txt?
Apparently, the last line of defense against cheating is loading SAV files and trying to find "inconsistencies."