Every time the VPOC migrates to a new price, the old VPOC doesn't disappear — it stays on the chart as a record. The question is what happens to that prior level afterward.
If price never trades back through it, it stays Naked. In Auction Market Theory, a Naked VPOC represents unfinished business: the market once declared this price fair, then walked away without anyone reaffirming or rejecting it. The auction is incomplete.
The moment price returns to that level and prints even one trade, it becomes Tested. The declaration has been acknowledged. The market has had a chance to reject the level or accept it. Either way, the unfinished-business condition is gone.