Is there a way to ignore comment blocks for analysis?

yes, :skip-comments true

A more recommended config is :config-in-comment {...} though, so you will still get linting, but can disable things

The next release of clj-kondo will suppress redundant do in .cljc files if it's not redundant in one language branch. E.g.:

(do #?(:clj (+ 1 2 3)) (+ 4 5 6))