YES

# Compositional critical pair system (Shintani and Hirokawa 2022).

Consider the left-linear TRS R:

  -(0(),x) -> 0()
  -(x,0()) -> x
  -(s(x),s(y)) -> -(x,y)

Let C be the following subset of R:

  (empty)

The critical pair system CPS(R,C) is:

  -(0(),0()) -> 0()

All pairs in PCP(R) are joinable and PCPS(R,C)/R is terminating.
Therefore, the confluence of R follows from that of C.

# emptiness

The empty TRS is confluent.