`pyrolytic` does not exist as a keyword for ovens in my country. I just checked at the biggest retailer for such stuff.
The cleaning module of the one oven I'm aware of that had that option was more than just a heating thing. The manual talked about foam and how to refill it. Different countries, different mechanisms I assume.
But yes, it is just an element that can go hotter and a shell that can withstand it. Ovens are incredibly overpriced for how rudimentary they are IMO. Ripe for 'disruption' if you had something non-bullshit to compete on but price - sizing is already standardised.