Ps let me know who the doc is so I don’t attend their practice.
He doesn't contend (nor do I!) that the vaccine induces the flu. His observation is that the nature of our highly mobile population has hugely increased the rate at which the viruses mutate and end up increasingly - even, almost entirely - dodging the vaccine's profile. Mentioning those who've had the flu despite the vaccine or never had it despite being unvaccinated is just illustrating how fast that moving target appears to be, relative to the annual mass production timeline and process.
Note that this has bupkiss to do with the larger vaccination topic. The anti-vax crowd make me crazy.