I wonder if the fact that they called it a "living" systematic review is exactly because they have insufficient crumbs to use for the interventions they want to promote (CBT & exercise). So that when the inevitable criticism comes that bringing in 1 study for each main conclusion is not a "systematic review" they'll go: "Well, duh, it's living, it will be updated with additional publications."
Which would still make no sense for an organisation for which creating "living" systematic reviews can be appropriate (like Cochrane), and would be utterly ridiculous for what is just a journal publication.
(Handy if that's allowed if you want to produce smoke & mirror reference fodder for the promotion of your preferred intervention though.)
Edited to add: sorry if this has already been mentioned - I'm following this thread a bit, but haven't read it all.