Agreed. Additionally what I am missing in the article (correct me if it is in there) was any mention of the original training volume vs. the S&E training volume. If an athlete is riding a bike 20hrs a week and adds 2 hrs of strength training to this, I would find it very plausible that they could indeed reap some benefits. The question really just becomes, are they compromising recovery. In this case, if we take the study as accurate, it appears that the upside of the additional training volume outstrips any downside of compromised recovery.

On the other hand, if they are actually removing existing endurance work to replace it with some strength work - that is more interesting in my opinion and would require a bit of re-thinking for those in the 'specificity' camp.

The former scenario really has little relevance to your average recreational triathlete or cyclist, who is likely not putting in 'maximal' training hours in S/B/R.