  A sanity check rules out certain types of obviously false results, but does
not catch every possible error. After reviewing such a sanity check for $NN$
bound states with the L\"uscher's finite volume formula[1-3], we give further
evidences for the operator dependence of plateaux, a symptom of the fake
plateau problem, against the claim in [4]. We then present our critical
comments on [5] by NPLQCD: (i) Operator dependences of plateaux in NPL2013[6,7]
exist with the $P$-values of 4--5%. (ii) The volume independence of plateaux in
NPL2013 does not prove their correctness. (iii) Effective range expansion (ERE)
fits in NPL2013 violate the physical pole condition. (iv) Ref.[5] is partly
based on new data and analysis different from the original ones[6,7]. (v) A new
ERE in Refs.[5,8] does not satisfy the L\"uscher's finite volume formula.
  [1] T. Iritani et al., JHEP 10 (2016) 101. [2] S. Aoki et al., PoS
(LATTICE2016) 109. [3] T. Iritani et al., 1703.0720. [4] T. Yamazaki et al.,
PoS (LATTICE2017) 108. [5] S.R. Beane et al., 1705.09239. [6] S.R. Beane et
al., PRD87 (2013) 034506. [7] S.R. Beane et al., PRC88 (2013) 024003. [8] M.L.
Wagman et al., 1706.06550.
