Sure, but this doesn't really do any of that. If you just ship an inlined static site it will be this fast. You don't need any real "technologies" to do this. You just need leadership who will push back on the marketers/PMs who want to ship an entire petting zoo of third-party analytics trackers and A/B plugins.
If they’re using a framework to automate “inlining static sites”, and configuring it to be as fast as possible - I’d call that clever.
Adding analytics scripts or A/B testing is actually still possible, and not precluded by this method. If you prefer to do this manually to prove a point to your marketing team, go right ahead. But please don’t put down actual good work, just because you have high standards for what is “clever”.