Push putt creates spin through finger spring, you don't need to flap the wrist or use the elbow or shoulder.
Easy way to show and isolate this
https://www.youtube.com/watch?v=j9XHDK1Q7Kk (I got a bit lazy with a few of these - first one especially - where I flapped the wrist open or moved the arm a bit, but there are a number in there that are flying just by opening the fingers rapidly towards the basket. Elbow is isolated and not in use, neither is the shoulder.) using the legs to find some power and timed with springing open the fingers. it's not really a putting style but it shows you the power the fingers and slow, slow, fast can add to the putt.
Try it, lock your elbow and shoulder and starting at the basket work back just trying to eject the disc into the basket using your fingers, it will help your putt in general whatever style you use.
Blake was talking about this on DGR years ago and Beto made a similar video to this.
With putting stick with what works for you but for gods sake try everything till you get there. Don't listen to one person telling you "this is the way to putt" No it's not. I can't putt like Ricky, his fingers are twice my length, they can impart as longer levers far more spring to the putt. It's very useful for me to try out though and to find the bits that work from it. I normally push McBeths style as a style as it is so simple and efficient, very few moving parts and not much to go wrong, unlike Ricky's which is very complicated but honed from years and years of practice. Most people want quick and easy results, McBeths style is more likely to produce those than Rickys.
Try everything and as you are trying everything analyse the bits that are different and what they add but also the issues they bring to the table. There is no "right" style, there is the best style for you,