Most episodes involve some fictional futuristic technology being abused, but that was one of the few episodes that involved only technology that definitely exists today.
National Anthem
Waldo Moment (arguable, as it would definitely take some tinkering to set up that kind of Vtuber system, not just using an off-the-shelf system)
Hang the DJ (arguable, assuming it is just a fictional visualization of a bunch of simulations running in software)
Metalhead (arguable, as robot dogs do not seem quite that advanced yet, but definitely soon)
Bandersnatch (arguable that the multiple timelines and everything are just the character hallucinating or whatever)
Smithereens
Loch Henry
Mazey Day (though the technology is absolutely contemporary, it does feature a mythological creature or whatever)
Demon 79 (while it takes place in the past with just old technology, it features supernatural shenanigans again)
Most episodes involve some fictional futuristic technology being abused, but that was one of the few episodes that involved only technology that definitely exists today.