[None][fix] Fix is_post_quant_all2all_supported for MNNVL (NVIDIA#8355)

Signed-off-by: Tailing Yuan <[email protected]>

Author: yuantailing

tensorrt_llm/_torch/modules/fused_moe/fused_moe_wide_ep.py

@@ -445,7 +445,7 @@ def is_post_quant_all2all_supported(self):
         if not self.use_postquant_alltoall:
             return False
         if self.alltoall_method_type == AlltoallMethodType.MNNVL:
-            return False
+            return True
         elif self.alltoall_method_type == AlltoallMethodType.DeepEP:
             return self.has_nvfp4
         elif self.alltoall_method_type == AlltoallMethodType.DeepEPLowLatency: