Very sensible.
I was by no means trying to say I thought the article factual or something to base the birthdate of your children on - it's mostly amusing, with a dash of "hmm, interesting." I think even in the supposed studies that show a "season of birth" correlation, it's very small, like 5-10% - ie, too small to say with authority that seasonal birth is the true cause - it's all theory and a lot more testing would need to be done.
My guess is the article above probably heard of/saw such claimed studies as those linked below and made their own conclusions. Whether any of these studies are 'good' or specious is beyond me.
(linked articles are short study abstracts, no major reading)
Birth month and suicidal and depressive symptoms in Australians born in the Southern vs. the Northern hemisphere -
Cerebrospinal fluid monoamine metabolite levels in human newborn infants born in winter differ from those born in summer
Season of Birth Variations in the Temperament and Character Inventory of Personality in a General Population
Then there's the more cautious/dubious counterpoint view regarding studies such as these:
Does season of birth affect schizophrenia?
And if you want, you can Google season of birth effect and get all kinds of hits on the topic, usually related to schizophrenia, but other things as well. And often in PDF form, which I usually don't bother to actually read ...
Even the 'well known big' internet news sites often seem, to me, to not really quote sources, beyond "in a new study in Sweden, doctors say..." It's all about writing hypothesis/opinion newsbyte articles nowadays.