No on all counts.
The wake formation is inherently subsonic and virtually isenthalpic, and will not lead to much heating. Unless the aircraft just happened to be disturbing a fluid highly stratified with respect to temperature (e.g., riding a temperature inversion layer), there's no reason to expect the wake to vary in temperature. Any such variation would be dwarfed by the thermal contribution from the jet engines.
Secondly, there were no infrared cameras in action and pointed at those locations prior to impact. Nobody just turns one on and points it at the sky for no reason.
Thirdly, FLIR is not nearly sensitive enough to make calibrated readings of air temperature, as air is virtually transparent at its operating wavelengths, and air has an extremely low density and albedo. It would take a vastly more sensitive recorder, and you would need a way to compensate for the temperature signal from air between you and the aircraft, and from the background. This is not the correct approach to sense the wake.
The correct approach, if you were an experimenter studying the wake, would be to instrument the aircraft and the air with visible particles that follow the streaklines. For instance,
smoke and "telltales" stuck on the wings in a grid pattern, or
reflective particles in the air after ICV or DPIV. You'll note the actual photographs of wakes that we have use "particles," i.e., suspended water droplets or dust, provided by weather phenomena or debris thrown off at impact.
Technical questions like the above are fine, but for the rest, please leave the trolls alone. This subject is significantly more technical than any questioning Truther thus far can even comprehend, let alone dispute. You are trying to teach Shakespeare to someone who hasn't mastered the alphabet.