[Question] A basic probability question

From the logical induction paper https://​​intelligence.org/​​files/​​LogicalInductionAbridged.pdf:

Let φ stand for the claim that the 87,653rd digit of π is a 7. If this claim is true, then (1 + 1 = 2) ⇒ φ. I don’t understand the second sentence at all, any help appreciated.

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