This is the blog post here:
https://silca.cc/blogs/journal/part-...re-and-comfort
All five parts are worth a read for sure. I mis-remembered the frame, wheel, tire compliance hierarchy. The tire has the most effect (obvious to all of us I think), the frame is second and the third is the wheel compliance. The tests referenced in this blog were just done at the seat post I believe, not at the head tube or bars.