Auxiliary Suspension Systems
I think he's referring to the use of auxiliary bomb racks carried on hardpoints under the wings. This would correspond with the "FAB-250M-54 GPB, 40 x in Bomb Bay + Racks" and "FAB-500M-54 GPB, 26x in Bomb Bay + Racks" loadouts available in Command. Later on, Backfires also had this capability, and there is a picture of one doing so here.
The use of the word 'suspension' shows up several times in the article in the context of 'things suspended from the aircraft', rather than 'part of the landing gear', so I doubt it references rough field capabilities of a rugged undercarriage. There is also a translation of a Soviet Manual on the Maintenance of Bombing Equipment on the TU-16 Aircraft, full of all sorts of switch-by-switch instructions on how to load your Badger. It uses the term suspension in the same way, although, sadly, it doesn't seem to mention the auxiliary bomb racks.
One thing I found very interesting in the original article was the discussion of ready times for the Badgers. He mentions that 'The second strike can be carried out seven to nine hours after the first'. Also, he mentions that if the first strike comes on a winter evening, when there is less daylight than night-time, 'long-range aviation forces take off at minimum intervals and will be able to deliver one or two additional massed strikes during the hours of darkness."
So he expects the Badgers to be able to do a turn-around quite rapidly, and be back over the target once or twice in a long night. That would suggest, in Command terms, a 6-hour ready time (or perhaps a 6-hour quick-turnaround), rather than the 20 hour ready time they currently have.
Now presumably this is for a completely pre-planned operation, where all the targets have been selected, the pilots pre-briefed, and the ordnance guys given warning in advance. An impromptu raid against a new target of opportunity would take longer. Still, it's interesting to see that the Soviets did not consider their bombers to be "once-a-day" assets. A scenario designer could do this with Lua, but a player would have to force his ready time in the editor to simulate this.