Yeah I'll agree the slipping tires makes it just an initial pull test.
The Tesla motor is going to have way more torque available than the gasoline or diesel motor in the Ford, even with gearing. Those take RPM to get up to their torque range while the electric has most of its torque immediately. If they weighed the same, and were pulling the same drag load (not one another), I'm pretty sure the Tesla would still beat the Ford rather easily.
Also I didn't check prices but assumed most 49k F-150s were pretty basic optioned, and 250's starting there.