Anyone can write a letter to the editor. Doesn’t make it daas Torah.
That being said, I do think that allowing the girls to mature is not a bad idea. I don’t though think this should entail forcing them to wait before entering shidduchim, but rather teaching them to have realistic expectations in life rather than expecting marriage to be a luxurious paid for vacation.
As far as the support aspect is concerned, the dowry provided by the girls parents towards the Torah scholarship of the boy is appropriate depending on the individual shidduch in question.