rice porridge (aka congee) and the shelf life of thousand year-old eggs

I tested out the おかゆ(okayu) function on my rice cooker. Okayu is Japanese rice porridge, quite similar to Chinese rice porridge or congee. It worked quite nicely! Soft rice that still maintains its texture.

However, my thousand year-old eggs expired in December, so I am left with the burning question, do thousand year-old eggs really have a shelf life of a mere 3 months?

Update: Happy New Year! May it be a good one.