This is only for Engine Allowed games. It is not applicable in Engine Forbidden games.
Endgame tablebases are available where all possible positions with 7-men left on the board are stored in a computerized database that contains precalculated exhaustive analysis.
In engine allowed games, when a position is reached where there are only 7-men left (counting pieces and pawns from both sides) the server will internally connect to the tablebase website and set the result for the position (without 50-move rule).
The picture shows a typical position from the Syzygy Tablebase.
In engine forbidden games, there is no tablebase adjucation and the game will continue as usual. Players are not allowed to consult computer endgame databases in engine forbidden games.