The advice for Turbo was…
The advice for Turbo was more relevant when cars (vs diesel engines) got Turboed and yes some had issues. That was back in the 80s (SAAB being the first I believe). A trubo that is under a lot of load (uphill) may still have an issue, but on a Freeway you are not using max power (your fuel mileage would be below city driving if it was). Also, you don't just yank off a Freeway and shut down (short of an emergency). So you take an off ramp, hit a fuel station close by. By the time you have got there the Turbo has cooled down. If you are on a Freeway, climb a steep long hill and then pull off into a rest stop, give it a minute of idling but otherwise, as long as you have had some cooling down time its not an issue.