Thats the order in Elsawin. The brake system is split in to two diagonally arranged circuits so its intended to bleed one circuit then the other.
Elsawin also states 2 bar pressure (relative) to push the fluid through the ABS unit. I do this routinely, topping up a spare tyre to just over 2 bar for each corner when using the Gunson tool. The D2 reservoir is just fine with the pressure. I do also routinely inspect the reservoir for cracks or damage though as I did once have an A4 blow it's top off due to UV damage to the plastic. On the A4 you can see the back of the reservoir looking in from the windscreen so it can catch the sun. The D2's is fully covered though so doesn't suffer in the same way.
I've never had much success with the vacuum tools as I've found they always pull air in from the bleed screw threads so you can't tell when the system is actually bled. I much prefer to push the fluid through
