Guillermo Rauch is selling Vercel, whose strategy includes first-class tooling for SSR, convincing people to move their SPA to SSR, and then locking them in on their platform.
[1] https://rauchg.com/2014/7-principles-of-rich-web-application...
Referring to SPAs as a "zero-interest-rate phenomenon" implies that SSG/SSR models are more efficient in terms of financial cost of deployment. I don't agree this is necessarily the case, and I think SPAs can be developed and deployed sanely and cheaply also.
Vercel is doing some amazing things, but it's also innovating in ways that occasionally lead to "lock-in", in the sense that moving away from Vercel would involve a lot of friction. So I think it's fair to point out that you have a financial interest in convincing people to adopt delivery models that your business streamlines.