Yeah they were attempts to either fool the Javelin's sensor and make it fly too high or serve as improvised spaced armor to reduce the effectiveness of its HEAT round. FPV drones have much smaller HEAT rounds and a lot less kinetic energy so improvised spaced armor may be more effective.

"Cope cages" to describe improvised armor was always propaganda though. US soldiers in Iraq put improvised armor on their humvees to protect against IEDs. In WWII solders piled sandbags and spare tracks on their tanks (you can see many pictures of tanks like this). Field improvised armor is as old as warfare. Often it was not effective. For instance, tank designers in WWII thought that improvised armor reduced the chance of a ricochet, which was a serious problem with the era's AP rounds that saved a lot of tankers. Improvised armor gave the AP round something to "grab ahold of" and aid penetration.