In xiangqi, the knight's movement is restricted by a piece placed in front of it in the direction that it wants to move to. If that was the case in chess, a triple check would be possible if e8=N+++ was played in the following position.
This is impossible in this position because before the promotion, the black king is already in check.
Did you not read what he wrote? He was talking about xiangqi rules, where the knight would not check the king because the pawn was in the way.
In shangxi. Pawns cannot promote
also there are no queens in xiangqi
However triple check is possible in shangxi