Agreed. It's going to tow more like a 270hp/317tq engine in conditions of high load for any extended period, not like a 325hp/465tq engine. The numbers don't tell the whole story because the 325/465 is not available continuously like the 359/479 in the GX even though it probably will be faster 0-60.Unless you are accelerating up a long pass you should be fine with just the gas engine, it has the same hp and more torque than the current 4 runner powertrain. If you plan on towing large loads up long mountain passes, this probably isn't the right vehicle for you.
But with a 20kwh battery - then it probably out tows the GX. That's where a PHEV will be great if it ever exists.