Their landing page doesn't work without JS enabled, not even a single line of text. I wouldn't recommend this to build a landing page.

If the objective of a landing page is to reach the largest audience possible in a sustainable, fast and efficient way, I wouldn't choose any SPA solution. And I must add that this comes from experience. For few years I did try to go the SPA way, with server side rendering, but the extra work and overheads are just not worth it.

IMHO, nothing beats static pages for landings.