Could someone please tell me if the summary available here is correct?
Rule is not very clear here, but I would personally still resolve Sneaking with a vehicle (driving inconspicuously, tailing someone at a distance, etc) as Reaction (Manual/AR) or Intuition (VR/Jumped In) + Stealth or Piloting (whichever is lowest).
Also, am I correct that the only advantage of a Control Rig that costs 3 Essence and 270k nuyen is a +3 dice for tests when jumped into a vehicle, rather than reducing the handling of the vehicle by that number like in previous editions?
It does both. Just like in previous edition.
Errata Feb 2020 p. 6
p. 283, Control Rig, paragraph 2
Adjust the paragraph to read as follows:
When you’re jumped in it provides its rating as
a dice pool bonus on and reduction in threshold to
all tests involving the operation of vehicle, and a
bonus point of Edge.Is this bonus also applied to attack tests?
Yes.
SR6 p. 197 Control Rigs and You
Each rating point of the control rig awards one extra die on tests involving the operation of a jumped-in device.what's it's MATRIX DR?
It is typically Firewall (of the network the device is part of) + Data Processing (of the network the device is part of). In this edition the intention seem to be that most drones will be part of some sort of network.
But it have also been suggested that a device that is not part of any network at all and doesn't have any matrix attributes of its own still get to use its Device Rating in place of Firewall (but not Data Processing). And in case of a Drone, Device Rating would in that case be equal to its Sensor Rating.
I believe a good house rule would be to say Data Processing is equal to Pilot (because Pilot serves a similar limit to the number of programs the vehicle can run simultaneously)
As mentioned above, most drones will probably be part of a network of sorts - but I think this ruling sounds fair.
(and could perhaps also be used for standalone smart weapon platforms as well).