The funniest thing. It's straight out of Russian/Soviet playbook. Which Serbs employed against NATO. Fake bridges, fake armor, fake SAM sites, etc. Out of all sorts of material. With some having their own signatures, both in IR and radio waves spectrum by using simple heat pipes and even bonfire to microwaves and even mimicking radar emissions of SAM sites by using spare radars, along with other makeshift means.
It was very effective coupled with Serbian SAM operators dismaying and disrupting
NATO tracking and targeting of Serbian army in Kosovo. And while Serb SAM operators might have fired over something like 700+ surface to air missiles and brought down only a dozen or so planes from manned and mostly unmanned.
The fact is those Serbian SAM systems, that where already familiar and compromised systems to NATO like SA-2, SA-3, SA-6 and SA-9, SA-13 along with some field modded IR guided air to air missiles into a SAM system and bunch of non radar guided AA guns.
Still kept NATO pilots on their toes. And interrupted and disrupted NATO air force every time those SAM systems fired. Which allowed Serbs in Kosovo to retaining most of their ground forces
and the ability move their forces around.
Decoys and SAM systems is what made NATO eventually force to
spread it's bombing out to economic and military targets in Serbia, . . because
they're attempt to destroy the Serb military like i said in Kosovo, which was they´re original campaign objective, fail miserably.
And even then Serbs actually
did effectively overcame the first NATO bombing campaign of Serbia
against at least military targets, but ultimately in the follow up campaign, Serbs were just too
badly outmatched to stop the second one especially against civilian targets (in Serbia) due simply that Serbs hadn't the equipment to protect both it´s army in Kosovo and it´s military infrastructure in Serbia along the civilian infrastructure of Serbia.
Anyway
As far as inflatable decoys. For Russians and Swedes it´s nothing new.
Along with decoys for planes and other shit. The Fabric used is capable of reflecting radio waves, radar reflectors can be used along with heat traps and piping to create a IR signature. Fake com traffic can be created, etc, etc.