no

synchronizing nodes often get blocks that are not directly tied into the best chain visible to that node, although the network claims will be part of the best chain. those are also sometimes called orphaned blocks.

Basically. If you want to split hairs you might say a block can only be stale if no other blocks are built on it, i.e. no multiblock reorg necessary. They put stale in quotes probably because it's a matter of perspective.