I think you have it backwards. In the last year, vaccines passports (in other words, immunization records) went from an obvious and necessary measure to a crazy wight wing conspiracy theory.
A year ago in my country, vaccine passports were very much a conspiracy theory, and back in 2020, our PM assured us they wouldn't be coming. [1] A year later, as the GP mentioned, this has instead become the standard to expect going forward. [2]. Exactly what they described has happened, something which was once considered an irrational fear of libertarians has become reality.
[1] https://globalnews.ca/news/7576955/coronavirus-vaccine-passp...
[2] https://globalnews.ca/news/8104692/canada-getting-proof-of-v...