Return of the ?

Which version of the ALGO is this

[GranPops]

Despite all the shenanigans from last November onwards, we had one site that maintained 340 on first page of serps and over 140 No.1's.

Nothing special about that you might add, except that there were zero backlinks.

On March 12th they disappeared down the lists.

Today they all came back, still with zero backlinks.