Comment on the Evidence of isostructural phase transitions in elemental zirconium

It is argued that the article by O.Bannon et al. ; High pressure stability of beta-Zr: no evidence for isostructural phase transitions, published recently -July 2021 - in High Pressure Research has no experimental foundation and the statement no evidence is absolutly misleading. Isostructural phase transition has been reported only in Ce metal, thus, the Beta-Zr to beta prime -Zr isostructural phase transitions has fundamental interest in condensed matter physics.