Yeah, as I understand it the idea is that instead of making the server-side complex and the frontend code complex, you retain as much complexity server-side as possible and treat the browser as just a hypermedia renderer.
If a part of the page needs to change, the server figures out what it should change to and sends that page fragment.
If a part of the page needs to change, the server figures out what it should change to and sends that page fragment.
At least, that's my cursory understanding from reading https://hypermedia.systems