I'm not sure anything says what your editorialised title, and comment link says.

They were calling out that an NGINX CVE that was Important took 20 days. They're saying nothing about what classification Amazon has set on PHP,.

> So, from the CVE publication to an available fixed package it took 20 days, not a month.

They specifically call out that it's not the same as the Nginx case:

> In contrast to the PHP's case, that CVE wasn't Critical, but only Important, that doesn't have the same urgency.

Roughly one release every 15-20 days.

Posts elsewhere have suggested that the embargo was broken early. Even the PHP release team itself didn't have sufficient time to update their public Docker images before it was published.