It makes them MORE indestructible though. With Vet3 they would be unkillable (by small arms fire).
Thats where the lawnmowers come in, you don't even have to counter a unit properly, just use relic's shitty AI coding to drive over them. (And FYI, using the 'halt' order with EIR's custom AI code that has units stay still in cover will get them run over even worse as they'll actually 'halt' in front of an incoming tank)