[lycier]

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Maybe Gib is given the imagination,how dare Gib W play 2♣ as a final contract?
It is a dangerous auction.

[1eyedjack]

For as long as opener (an opponent) may only have 3 card Club suit, it is not unreasonable, depending on context and under caution, to keep open the possibility that Clubs may be your trump suit. I have even known some players to play a direct 2C overcall over a 1C opener as natural, a practice which personally I think is absurd, but I am me and they are, er, them.

Nor is the principle restricted to opener's Clubs. In some situations if you trap pass in 4th seat after RHO has responded 1M, then later if you come in with 2M it may be natural, in the expectation that RHO has only 4 of them (you having 6 or 7).

The question to be addressed is whether, in context, it would be more useful for a 2C cue to be some artificial meaning. But if not (or if no consensus), and if there may be a case for 2C being natural, that is what it means.

So, systemically, I would expect, and have no complaint about, 2C in the example stated to have a natural meaning.

As to whether West has a suitable hand for bidding 2C, that I think is contentious. I don't think that I would have bid it myself. Normally I would be prepared to give GIB simulations the benefit of the doubt. In this case South has denied Heart support. Also would have opened 1D with 4, and might have rebid 1S with 4. So I think that the odds heavily favour South having at least 4 Clubs. 4 may be manageable. There is still the Club split between North and East to consider, but remember that East still has a preference bid to 2D available.