Husqvarna’s presence on this site is small in count and large in influence.
Its robot blade is on the shelf as the manufacturer’s own part, and it is also the reference point for most of that shelf: a large proportion of the aftermarket listings there name its robot range as the machine they fit. When a compatibility list on a marketplace names two makers, this is usually one of them.
The mulching kit follows the same pattern — machine-specific hardware, named by the machines it belongs to.
The scarifier is the one general machine here, and an electric one on a shelf where the same brand is better known for engines.
What this site can say about the robot blades specifically is that they are consumables with a short working life, that the manufacturer states this in its own documentation, and that a set past its life tears grass in exactly the way a blunt rotary blade does — which shows as a lawn that whitens two days after cutting.