Dr. Schick wrote the OTD rate is remarkably negligible.
Let’s not forget that the AviChai study is not geared toward analyzing the shidduch calamity; it’s to study Jewish education. What he may consider insignificant regarding the latter might be relevant to the former.
I have no idea if there are more older female singles in Modern Orthodox communities than older single males, and I am not meshubad to AZ’s opinion.