Yes it is needed according to the history

cecton · cecton · commit e6464c0458f6 · 2020-03-20T14:47:50.000+01:00
diff --git a/client/service/test/src/lib.rs b/client/service/test/src/lib.rs
@@ -159,7 +159,7 @@ fn node_config<G, E: Clone> (
 		enable_mdns: false,
 		allow_private_ipv4: true,
 		wasm_external_transport: None,
-		use_yamux_flow_control: true,		// TODO: is this needed for the test?
+		use_yamux_flow_control: true,
 	};
 
 	Configuration {
