And none of your links has anything about women shouldn’t get mammograms for a month after a flu shot because it screws up the tests.
Right?
You said that the flu shot doesn’t cause swelling in the arm and the lymph node. It does. Not always, but it’s a known side effect that happens.
As for mammograms, they give false positives for all sorts of things, including swollen lymph nodes. That’s why the American Cancer Society no longer recommends routine mammograms for women under 45: all the false positives were unnecessarily scaring women who had nothing to worry about.