The particular recent event which suggests this to him is the failure of the Egyptian government to place even 1/3 of the Treasury bills offered:
Yields on Egyptian government debt maturing in nine months jumped to nearly 16%, but the government could not place its local-currency debt to Egyptian investors, even at that exorbitant rate.
Spengler foresees a crash in the Egyptian economy with tourism - the foreign exchange earner - drying up and leaving no ability to pay for imported food and fuel. I'm glad I toured Egypt before the current mess.