Ok, that link states it will happen. Granted I agree with that. More specifically, can you point me to a link showing any of this happened in January?...or that it was the key reason for the spike in tax receipts?
Why does this surprise you? Outside of recessions, every year sees the most taxes collected because the economy grows and inflation occurs. Januarys and Aprils almost always run a surplus due to tax payment habits. Last year, they ran a bigger surplus in January than this year, for example.