Yes, it can usually be attached in this way. The trailer is mounted on the rear wheel axle; for bicycles with normal axle nuts, suitable adapters or a special axle are required.
It is important that your rear triangle is compatible and that the centre distance and installation width are suitable. According to the supplier, there are suitable adapters for solid axles.
A long one came like this, which you can push through the rear axle. Then you put the bob on the coupling and secure it with the 2 metal plugs. Everything went smoothly and I am not a good mech!
Hello Guido
I didn't know it either, but apparently that's the case! There are Yak 28 and Yak 26. However: "versions: MTB 26" has a 6 cm shorter clutch fork than the 28" version. 28" is suitable for all wheel sizes" But probably not the other way round.
Friendly greetings
Bruno