I have no doubt that you know how science works - one paper says one thing - another says the opposite. Im hesitant to even respond to a person quoting from studies from 1918 and 1938. And these are just responses from 'people' giving their opinions anyway - as compared to a scholarly reading. There is nothing that I saw in the 'questions and answers' you posted that suggests that good bacteria are killed - and bad bacteria survive.@MnFish1
I read the link you posted. I think that this link that documents specific bacteria response to freezing temperatures is more scientific with its terms. https://www.quora.com/Microbiology-...a-or-merely-slow-down-their-reproduction-rate
There was an interesting link on "myvagina" about freezing probiotics - but I decided not to quote it (and im not kidding). Instead here is a study on frozen Kefir from 2015.
https://digitalcommons.lsu.edu/cgi/viewcontent.cgi?article=4318&context=gradschool_theses
Though there is some decrease in bacteria - freezing was considered a viable/Improved method of storing kefir.