In this note, we shall point out that all ``numerically calculations'' and figures in \cite{ CaFrLeVa-23} are wrong because these calculations are based on some incorrect formulas. Furthermore, by pointing out several serious errors in \cite{ CaFrLeVa-23} and especially by Section 7, Proposition 7.1, Remarks 7.2--7.3, and Section 8 (a result of A. Pierzchalski and B. { \O}rsted) we show that the conclusions published by Matteo Capoferri, Leonid Friedlander, Michael Levitin and Dmitri Vassiliev (J Geom Anal (2023)33:242) as well as the main ``algorithm'' theory of the book \cite{ SaVa-97} are completely wrong. Finally, we explain the correctness of proof of Theorem 1.1 in our paper \cite{ Liu-21} by giving some remarks and putting the whole proof in Appendix (see also \cite{ Liu-22b} and \cite{ Liu-22c}).
Categories: math.SP math-ph math.AP math.DG math.MP