Yes, living off dividends day to day can be done. I'm semi-retired at 47 and doing it now. However to make it happen there is an important piece of the puzzle that these folks miss: You have to have a lot of cheese saved first. As a very rough rule of thumb, you can get $1,000 in dividends a month from evern $100,000 invested. Now keep in mind a yield like that will most likely sap your portfolio of any fund growth because it's all going out the door as cash.
I don't know that most of the young people trying to follow these influencers has anywhere near 100k saved. And if they do they'd be dumb to put the whole nut in a dividend play and not diversify. The solution for these brokeass dividend wannabees then is to chase even bigger yields which over time will erode their principal.
The only tried and true solution is time in the market long term. I have around 2 mil saved and am getting 18 - 20k a month in dividends. It can be done but for me it took decades to get here.