On this we can agree. I personally highly doubt that solid metallic hydrogen is metastable at atmospheric pressures. My critique is about people saying that's been experimentally proven which it has not been. The 2017 study especially had a lot of criticism from the high pressure physics community about whether they had even achieved metallic hydrogen. I haven't heard much about the 2019 study since it was published. I have linked 2 articles below about this topic. One is about the debate of the 2017 experiment with current models of how metallic hydrogen is expected to behave and it touches on metastable metallic hydrogen. The second outlines the possibility of two phase III structures of metallic hydrogen.
https://aip.scitation.org/doi/10.1016/j.mre.2017.10.001
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.94.134101
On a personal note I wasn't thrilled with them including metallic hydrogen but I don't understand how it's getting more hate than a "torchship". Maybe that has the magical popcorn drive KerikBalm invented.