Hang on... I'm just going to have to spell this out to make sure I'm understanding you correctly.
Are they saying that to recognise something that has been designed, it must be distinguished from the naturally occuring or undesigned, and that whether it appears to be designed or naturally occuring is a meaningful indicator of whether it was or not?
If this is the case then by recognising that the faces are the products of design, the IDer proves that god didn't have a hand in making any of the natural world!
If that makes sense then you are right, it is funny!
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