I obviously disagree.
1 - many drones aren't visually controlled by a human, but instead use radar. A fake tank - unless it's constructed in such a way as to reflect the same profile as a tank. Anything made out of cloth, wood, or rubber won't do this. It would have to be metal.
2 - even if the above factor was no longer an issue, all fake tanks do is cause the other side to waste ammo. But getting those fake tanks out there requires a significant logistical challenge, not just with the material involved, but with the manufacturing (as relatively simple as that seems) and with the transport and placement for effect. These are not simple matters, and would detract from logistics support for more important missions.
3 - Germany and England both used fake tanks (and I think France did, too), but all three of them had powerful industrial bases backed by uber-patriotic populations who knew their lives were on the line. Armenia's population is patriotic - as is the case with almost all nations - but they also know that the sovereignty of their nation was not truly threatened, and they have no powerful industrial base with the wherewithal to take on such an added burden.