Alright. A Tesla P100D has 778hp and a curb weight of 5003lbs. That's 6.43lbs per horsepower. The Tesla does 0-60 in 2.5sec, and 0-100 in 6.4sec. The Hummer has 1000hp, and GM is only claiming 0-60 in 3.0sec, so how much can the Hummer weigh and achieve a 0-60 in 3.0sec? That's easy, 6430lbs, and let's round up to 7000lbs because we're only talking 3.0sec.
The P100D battery weighs about 1200 pounds, but an ICE Hummer has an engine, transmission, and three differentials. Oh yeah, and a cooling system and a 60lbs battery for the electrical system. The EV will have two motors (maybe three), two differentials, but no transmission. A fully dressed V8 gas engine will weigh in at maybe 600-700lbs, the transmission about 300lbs, and 100-150lbs for the front and rear differentials, and probably 50-75lbs for the center differential. (These are educated guesses.) So throw in steel driveshafts, and lets guess the ICE drivetrain weighs something like 1400-1500lbs.
Each Tesla motor weighs 70lbs, let's say 100lbs for grins. That's 200lbs total, and another 200lbs for differentials. So the Hummer EV drivetrain probably weighs something like 1200+200+200 = 1600lbs. But even if it weighed 500lbs more, I still believe GM's performance estimate even at 7000lbs.
My point about safety is that I've driven a P90D, and there's no planning necessary. You just punch it, and speed happens. Now. It's totally different than an ICE car. That's what max torque at zero rpm does. I think a huge 7000lbs vehicle with instantaneous power is more dangerous to others than a similarly quick 2020 Corvette. And, BTW, the 2020 Corvette is testing out to meet GM's targets, so that gives them some credibility you're not giving them.