Yes and No
YES: if your item sells either on eBay, Etsy, Shopify or Depop, it will be automatically delisted from other marketplaces (except Vinted).
NO: if your item sells on Vinted, you have to delist your items manually after a sale.
How long does it take? approximately 5 minutes after you have sold an item
We know how useful this feature would be for all marketplaces, so rest assured that we are working hard to implement this for Vinted, too, in the next releases.