Ah the Italian Tuneup! Count me as a fan.
Diesel engines in general like to be worked hard. Otherwise they are prone to
wet stacking, ring deposits, oil dilution, and with EGR system, buildup in the intake.
If your engine is in otherwise decent shape (esp. timing belt, valves adjusted, good injectors, healthy cooling system) you may help things by working it hard at least once per drive, when
thoroughly warmed up (important!) and when the chance presents itself.
I do not agree completely with your Quora thread source "drive it in each gear for a minute at redline," that seems excessive to me but if you come across some steep hills or freeway onramps just wind it out at WOT to burn out any carbon buildup. I notice the first time I do this each time it leaves a pretty thick brownish haze, second and consecutive times it's clear.
I too had an Alfa, and the Italian Tuneup was a given. Mostly to make me smile and remind me why I put up with all the other tribulations of maintaining an old Italian sports car. That all-alloy DOHC engine (not common in a street car in its time) was basically a detuned version of a well proven highly regarded long career racing engine. Enzo Ferrari was one of their engineers before he went off and started his own company.
I'll move this thread to the more appropriate "Diesel Engine and Drivetrain" section.