Hmmm I took a look at the youtube you posted. I don't think she muffed that one. She did not say "costs of education is very low" which I believe you are thinking about, correct if I am wrong. She had stated "the costs of eduction for the young ones is very low". (The person who did that youtube looks to have intentionally left out the words "young ones" in the multiple interposed written words, shame on him or her). For me that meant primarily those in kinder, primary and perhaps some or all of secs. But university education imo is not "young ones". Along that line, personally I found putting my two kids through to mid sec where they are now is low if one looks purely at the costs from the actual schooling (ie minus pre-kinder playskool, extra cram classes or the enrichment classes like that guy asking for subsidy to put his 8yr old through ballet enrichment). For the low-income, they will understandably view the costs as high as they would any costs by dint of their financial situation. A McDonald set meal to us middleclass is costly to them too. A clerk in my wife's company, divorcee with kids, took on second job at McDonalds to get more money and at same time, their dinner was the leftover burgers she would take home after the end of every of her night shift.
But you are right in that she could have added about doing something substantial to helping these poors who find even "low" eucational costs to be a heavy burden.