Where did you get this thought?
That seems impossible as it takes more than three years for an SSN to finish outfitting and undergo sea trail in China.
This is absolutely true.
Information we have now:
1. Y-20 entered service today and the ceremony was held in CFTE.
2. A rehearsal was also held in Qionglai. There is a high probability that there will be another ceremony and media coverage tomorrow.
Whether this is DF-ZF or not is still unclear, but it is most probably a HGV. I drew a stereogram for it (without the booster/final stage) and uploaded to Wikimedia Commons.