Hmmm, I’ve seen that here. Just noted in passing, didn’t give it much of a thought...
I confess to not having read all this article but it reeks of snake oil to me. For example, every square cornered cut made is a stress riser.
http://www.pavementinteractive.org/dowel-bar-retrofit-construction-practices/
I put this in a similar category to foam insulating the underside of a roof. It is a bandaid for a problem that should not be there in the first place and that is HVAC duct work in the attic. For less money and more effectiveness you can retrofit with a full-up zoned mini-split system and throw away all the stinking duct work.
Foaming the underside of decking not done right in most climate zones just creates new problems.