Well ... sort of. It is using the heat to melt the toner which has been electrostatically attracted to where the print should be.
It is not the same as the thermo-sensitive papers, such as were used in the "Thermo-fax" copiers once made by 3M, and in some low-budget or low energy computer/calculator printing systems -- such as the ribbon printout on the Cannon 4-banger which was my first electronic calculator. Yes, those would darken fully in a hot car -- or fade from exposure to UV light. Vastly different from a laser printer (which is a Xerox machine which is copying an image imagined by a computer, rather than a real object.)
So -- this kind of publication is unlikely to fade with time -- though if stored in contact with plastic, it will partially transfer to the plastic, as you may have seen in some three-ring binders. :-)
Enjoy, DoN.