Yeah, this info is totally in accurate. 1. There was no GSL-SE in 1983. The GSL-SE was offered as the top trim level for the 1984-1985 model years, which was the first RX-7 to get the 13b rotary and a 4.11:1 axle ratio 2. The 1984-85 GSL-SE tipped the scales at 2375lbs. 3. I can confirm that my 1984 GSL-SE is gear ratio limited to around 130mph at redline in 5th gear.
It seems the author has conflated older 12a performance figures and 2nd gen weight info to make this quite slow and rotund mythical 1983 GSL-SE