On a bicycle with a normal ~39" wheelbase and a single rider, it's absolutely true. Unfortunately, on bicycles with 70" or longer wheelbases and multiple riders, i.e., tandems it goes the other way and I don't think you'll find tandems addressed in those articles.

The following values are notional...

That's why you'll find tandems for the masses from Santana, Burley, Trek and some others spec ~55mm rake on their ~73° head tube tandems to yield steering trail in the ~1.9" range compared to 'performance' or 'racing' tandems (which also use ~73° head tubes) all with steering trail in excess of 2" such as:

- Co-Motion's with OEM steel fork @ 50mm w/2.1" of steering trail
- Burley's 'Race" @ 48mm w/2.2" of steering trail
- Co-Motion's Carbon forks @ 45mm (Wound Up) and @ 44mm (Alpha Q) w/2.3" of steering trail
- Calfee's @ 44mm with Alpha Q forks w/2.3" of steering trail

Going the other way are the incredibly plush tandems from Bilenky using steeper head tubes and ~57mm fork rake to achieve their desired spec of 1.65" of steering trail for all but their smallest or largest tandems.

It's all highly subjective, but at least when comparing 700c tandems there appears to be an inverse relationship in how steering trail influences the handling of a tandem vs. a single bike.