Is v-lazy-image SEO optimized?

I use Nuxt to SSR the content of my page. When I look at rendered page content I see that all my images are just black 1px image which is used in the `src-placeholder` attribute. Is it needed to provide a fallback with regular `img` inside `noscript` tag when `v-lazy-image` is used or it automatically handles clients that don't support scroll similar to how [lazysizes](https://github.com/aFarkas/lazysizes) does it?