Well,
I think it is perfectly compliant with google, because it complains about unused javascript if it is slowing down / not needed for rendering the page. As long as your page looks good without loading the script it is perfectly fine to load it later. Here is the relevant link https://web.dev/optimize-fid/, which says:
JavaScript size bloat, heavy execution times and inefficient chunking can slow down how soon a page can respond to user input and impact FID, TBT, and TTI. Progressive loading of code and features can help spread this work out and improve interaction readiness.
So you can consider WP Meteor as “progressive loader” of the javascript
WBR,
Alex