May visa Bulletin

I will be current next month if I successfully retain my PD. Please see my signature.

I sent a letter to CIS to retain my PD when my old NIW got approved last June. No response, no LUD. Then on Dec 1 I sent the letter again. No response, but on Jan 06, I saw a LUD change on the old NIW. Does it mean that CIS look at my old NIW case and change my PD? Does somone have any idea?
 
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