You will find "A simple SPA has the following disadvantages, which are solved by SSG" in this article Cons section, which means those disadvantages are for the SPA without SSG, not for JAMstack itself.
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why does JAMstack is weak on SEO? On the contrary, it provides great results, especially on performance side, comparing to SSR.
You will find "A simple SPA has the following disadvantages, which are solved by SSG" in this article Cons section, which means those disadvantages are for the SPA without SSG, not for JAMstack itself.