I think we should break this down in two parts: Operation at low temperature and impact of a "hot" rover on the environment.
Most semi-conductor based electronics as we have them today don't have an inherent problem operating at very low temperatures. The characteristics of e.g. diodes and transistors depend a lot on temperature, which plays an important role in all analog circuits (e.g. sensors) and less so in digital circuits (processors, memories).
We can't assume to take conventional circuits to Titan and operate them there without issues, we have to design them specifically for low temperatures. This is, in general not too complicated, it mostly boils down to selecting the right components and defining things like working points and gain of transistors correctly. This can be tested and verified on Earth without too many difficulties.
One important issue is mechanical stress due to the huge temperature differences that can damage components as well as solder junctions if not done properly. Again, this can be mitigated without too much effort and a well made design.
Were we run into real problems are all chemical components like batteries. Chemical processes tend to slow down a lot at low temperatures, so most batteries won't work well at already moderately cold temperatures. One might think about replacing batteries by capacitors. But unfortunately high-capacity capacitors rely on electrolytic fluids and can't stand too low temperatures as well. There is still a possibility to not use batteries at all: In current rovers they are needed to be able to deliver enough power during operation of high-power devices while the power generator is only designed to deliver enough power for the average consumption. This saves a lot of weight on the generator side.
The only viable source of power for such a rover is some form of nuclear energy source (currently most likely RTG, but a fission or fusion reactor can be possible choices in the future). If the generator source is designed to be able to cope with the peak power usage of the rover, there is no need for batteries any more. The weight penalty will be high, but it's a working solution.
These power sources have the additional advantage of delivering a huge amount of direct heat that can be used to keep the rover warm. It's obvious that for operation at very low temperatures insulation must be much stronger compared to current Mars rovers, and there need to be (for example) heated storage places for sensitive equipment.
Compared to the statement in the answer, I don't see an actual problem of operating parts of the rover at temperatures that are at least 100K above ambient (that is, -50°C in an -150°C environment). Insulation is something that works very well and there is no reason to assume that any of the exposed parts of the rover will be anywhere close to this internal temperature. For comparison, people regularly move around at ambient temperatures of more than 60K below their body temperature and can stand this for hours with a heating power of just about 100 W.
Cooling due to heat transfer to the atmosphere on Titan is not that much more than on Earth: Atmospheric pressure is 1.5 times higher, density about 2.5 times higher, heat capacity a bit less - that's about a factor 4 under strong wind. If there is no wind, only convection will play a role, but this is less than on Earth due to the much lower gravity.