You may not need a working explorer. You need everyone to state his current block and type block hash and full data of block to compare our blocks and check who is on the right chain. That is if there is any right chain.
It is a whole fuckin ponzi scheme.
It should come from the dev himself, No one will just use someone else node, It should be officially announce by the dev himself.
A working blockexplorer is required to ensure everyone will be on the correct chain for the swap.