OPtion B is priced based contracts which essentially means that all risks not listed as compensation events fall up the Contractor.
The first sentence of clause 26.1 says “If the Contractor subcontracts work, he is responsible for Providing the Works as if he had not subcontracted” so on the face of it, it is a Contractor’s liability risk.
Does the risk of a supplier not delivering on time satisfy the criteria of 60.1 (19) ? I don’t think so.
However, a supplier acting in this rather extreme way is surprising and MAY possibly satisfy this criteria. Even if it does, then the compensation event could be assessed at zero if “it arises from the fault of the Contractor” - see clause 61.4, so the Contractor needs to demonstrate that it acted competently in selecting them etc.