Just asking ... you seem to suggest that you know emphatically that this is not happening - as compared to just thinking that it probably won't happen.
If so, can you offer an opinion about why a re-torque is not considered necessary, in this case?
Not a problem, re-torque or not, provided the low temperatures were taken into account and the installation procedures adjusted, if necessary.
And, every chance that it was not even necessary. But it should have been a consideration.
In any case, any necessity for re-torque would only apply to fasteners used during the engine change and installed at non-standard temperatures.
Other considerations would be any "stretch bolts or necked fasteners" that are normally torqued to or even exceeding yield, though these are usually single-use fasteners anyway.