According to this[1] LTE macrocells range from 20-69W "at the antenna connector." When they operate at the high end of that range, however, they're serving wide, sparely populated areas from atop large towers; you can't usually operate that much power where cell density is high.
And the GP is correct; both the e-field strengths and the exposure intervals in this study are far beyond what people actually experience.
Huh? The ambient e-field is about 50-300 V/m, depending on <all conditions> and can be much stronger during a thunderstorm. However, those are essentially static fields.
Hmm. RF power density in free space is a function of V/m: W/m^2 = (V/m)^2 / 377. The constant at the end is the impedance of free space. If you wish to compute the power absorbed by a rat you'd need to know its impedance, or perhaps the impedance of some specific organ.
That's probably a tough thing to calculate in a definitive manner given the number of conceivable variables. And does it add anything to the conclusion? All rats are likely to impede about the same at some frequency, so whatever the answer is it's effectively a constant; one that a rat can't do much about while remaining a conventional rat. Why not simply rely on the easily measured/reproduced V/m and assume that all such rats are experiencing the same power flux?
Edit: back of the envelope, 50 V/m is equivalent to standing 2m away from LTE base station with 60W power and 18 dBi antenna gain.