YES

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

Consider the left-linear TRS R:

  W(W(x)) -> W(x)
  B(I(x)) -> W(x)
  W(B(x)) -> B(x)
  F(H(x),y) -> F(H(x),G(y))
  F(x,I(y)) -> F(G(x),I(y))
  G(x) -> x

Let C be the following subset of R:

  G(x) -> x

The parallel critical pair system PCPS(R,C) is:

  W(B(I(x1_1))) -> W(W(x1_1))
  W(B(I(x1_1))) -> B(I(x1_1))

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

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

Consider the left-linear TRS R:

  G(x) -> x

Let C be the following subset of R:

  (empty)

The parallel critical pair system PCPS(R,C) is:

  (empty)

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.