You normally specify a rating range of the opponent you're searching for, so if the cheater isn't targetting GM level himself (in which case it's happening already), the system can't really do it.
Of course the system could go ahead anyway, displaying a fake rating - within the search criteria - for this GM / bot, but given that there are always false positives (and it would have to be done for merely suspected accounts, as you said yourself), it would essentially mean deliberately pairing some innocent players against, well, effectively cheaters. Which kind of defeats the core purpose.
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If the system suspects a cheater, maybe it can just match them up against a GM (or beyond GM) bot to confirm?
You normally specify a rating range of the opponent you're searching for, so if the cheater isn't targetting GM level himself (in which case it's happening already), the system can't really do it.
Of course the system could go ahead anyway, displaying a fake rating - within the search criteria - for this GM / bot, but given that there are always false positives (and it would have to be done for merely suspected accounts, as you said yourself), it would essentially mean deliberately pairing some innocent players against, well, effectively cheaters. Which kind of defeats the core purpose.