I think he’s arguing against absolutism. If you’re pregnant and have had COVID or can keep your chances of catching it low by staying/working from home the potential risks probably outweigh the benefit of the vaccine.
But that’s not what’s being communicated.
Your proposition is "a virus many times deadlier then the flu in a target group who have more serious outcomes from anything, what could go wrong?"
And your evidence is: "well for someone who currently has effective natural immunity.."
[1] https://www.health.gov.au/sites/default/files/documents/2021...