Theres numerous studies to support that.
Not saying its the cause but just saying its one possible cause along with obesity and abortion restrictions if we're throwing theories out there.
chronic COVID-19 infection may have more adverse effects on the menstrual cycle than COVID-19 vaccines, which have so far presented no long-term adverse events linked to fertility or reproduction
So there’s nothing detrimental, just a temporary change (which can happen for many reasons).
The studies all conclude that and agree with you but still seems unusual to me.