I strongly suspect that there was a miscommunication between the agent and the OP, and the usual process of reissuing expired funds as a voucher is what was actually referenced.
There's often confusion regarding travel fund "extensions" vs "reissue as a voucher." I try to always make that distinction for clarity's sake.
There's no "reinstating expired funds," and at this time Southwest hasn't announced any additional covid-accommodation extensions (and, IMHO isn't likely to, especially specifically "all travel funds of $100").
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