You need it to move with the real air defense systems.
Not really... the Pantsir this decoy is pretending to be wont be on the front line... it will be 4-6km back from any front line and would likely rarely move except when the front line moves... as part of a proper IADS it would certainly need to move all the time but its a balloon not a land mine...
Such balloons can't be moved once full of air by people.
Dude... it will be filled with air... not helium... just dig up the pegs driven in to the ground to hold it in place and then a group of people could walk it around no problem at all... it is not going to fly away or drag them up in the air or anything...
With normal air in it it might be 300kgs or so but 8-10 men could grab the eyelets where where the cords hold it to the pegs and drag it around easily...
Need first to take out the air then move it.
Only for very long distance moves... and even then we are not talking emptying a swimming pools worth of air through a straw sized tube... not only will they have wide venting holes to allow it to be rapidly inflated or deflated, they will likely have a pump machine to do it... both inflate and deflate... it is not the dark ages you know...
Russian put all their AD system on truck because tgey need it to be mobile fast. A truck mounted decoy can follow them. A balloon not really.
The Russian AF and Aerospace Defence and probably the Naval forces use trucks... the Army use tracked vehicles for better mobility across difficult terrain to keep up with the vehicles they are protecting... there is no reason why a dozen decoys could not be rapidly deflated and put on the back of a truck and shipped anywhere... ironically the actual Pantsir vehicles will be fully operational protecting the convoys on the move... using decoys then would just slow them down...
Any country has thousands of older trucks worth nothing that can be changed quickly to looks like a pantsir or s-300. If the engine breaks you can always get another truck ready. And you need only one guy to drive it, not twelve. Having an engine means also power for a dummy radar.
Keeping a wide variety of old trucks operational would be a logistical nightmare, they would take a hell of a lot more space up than a folded balloon in a bag, but my obvious question would be... I have seen lots of balloon based decoys including S-300 vehicles which are only used by the forces you claim use trucks to move everything around... why would they have balloon versions of trucks if they use real trucks as decoys?
Why have balloon decoys at all if they are so useless?
Note the point is not that they need to very accurately and precisely emulate the target so even with a detailed inspection the enemy will be totally fooled... the point of them is to make them cheap enough to use in numbers and distract a fair share of enemy fire power in dealing with something that is not actually a threat while leaving alone vehicles that actually are threats.
I can honestly say I have never seen the Soviets or the Russians use old model equipment with minor updates or changes as decoys... most of the time they have proper upgrades and are used for their original purpose. The exception would be the really old SAMs like the SA-1 and similar systems that are now used as training targets... not decoys.