Not OP, and this was Hotwire Rails with Stimulus but I also saw a similar reduction in moving a page from React to Hotwire. It was actually a new page, with significant changes so couldn't be trumped up to just a rewrite. But this was easily 1/10th if not more of a reduction in LOC than the similar React app it was replacing, with the more features, and a like a 90% increase in performance.
