Stats can be buffed you know. The CoH1 USF did fine with M10s and without an OP TD while having the same lineup of vehicles. Except in CoH1 the USF actually had to make an effort to overrun German heavy armor instead of just kiting it at max range.
Though I would rather see the M10 being an Su-76 type of light TD.
But we digress.
CoH1 had deflection damage on anything, bounced attacks still dealt damage.
You're comparing apples to oranges, 2 completely different damage systems.