The authors have hardly studied all the publications on how dogs behave when daily routines were changed, so the term "first study" is exaggerated.
I think that according to the statistics, the strongest finding is that dogs who showed SRB in February or May had increased odds of having SRB during the subsequent measures which is not surprising. What is surprising though is that 55.7% of the dogs who were reported to show SRB in February (before the pandemic) were clear in October which is good news. However, the authors do not focus on this result and do not explain this finding.