Torque does affect the tyre wear at equal weight. The more torque, the more load on the interface tyre/tarmac and the rubber cohesion gets more solicited causing more wear.
Yes the weight may be a greater factor in this instance but torque is also a factor.
look at rear wheel drive front engine car (typical bmw/mx5), the rear tends to wear faster although the weight distribution is biased towards the front. On my mid engine race car, despite looking 10% in weight and keeping the same weight distribution, adding 50% extra torque changed the tyre behavior; wear increase, pressure increase, everything had to be reviewed.