That advice is outdated IMO.
I'm on my 4th DPF car only do under 7k miles most of it on A and B roads.
On average my longest run a week is 12miles.
Had my diesel Tiguan near 2 years now and interrupted a burn at least 5 times during that period.
IME it was mainly early DPF cars that had issues.
Its not quite that simple. Newer cars may well have revised DPF management schemes, but there are still a lot of other factors that will affect how quickly a filter may become obstructed and need a regeneration.
Just for example, the Passat I have was available with 150 or 170bhp options. Now I do not tow with it, so the circumstances are quite different, but my tame garage and others tell me the 170bhp version (the one I have) needs to regenerate far more frequently than the 150bhp versions. It is also highly dependant on the distance and speeds and consequently the engine temperature you can achieve in your normal driving. I live in a conurbation where speeds are typically restricted to 20, 30 and 40mph, and in parts a lot of stop - start congestion.
I suspect the fuel economy savings of my diesel are effectively eroded when I have to deliberately go and find a dual carriage way where I can run the regeneration to clear the DPF.
When the we have got through the pandemic, and my financial position is clearer I will be looking for petrol PHEV as most of my journeys could be done on electric only range, and becasue Birmingham and several other towns and cities in my locality are setting up Low Emission Zones and charging me when I have to go to the several hospitals for appointments.
I do not tow with my Passat