A lot of the time when a putt is called nose up it's probably actually slightly nose down or nose neutral but with a big enough gap between the nose and launch angle that it still can float up and stall (shown in video). This is what most of Simon's putts are I believe, unless he's doing a low ceiling putt where a even going to a knee doesn't open up a high launch angle path out of the low ceiling (high launch angle but starting from close to the ground so there's time for it to get out of the ceiling before it goes too high).
I would definitely agree that a lot of people miss read nose up putts for actual nose neutral putts.
Though, I'd also argue that Simon doesn't often putt nose up.
And I know from experience playing with Ricky, the putt you see on camera is not what it looks like in real life. We had a good joke about it too.
If you're actually putting pretty nose up, you're going to have a lot of serious putting issues with disc rises, or disc stalls and hyzer outs. It's not like throwing where its going to power to apex then stall. Nose up is going to be stalling the whole time at that low of speed giving you a really really inconsistent putt.
I have a lot of people criticize my putt for being nose down and think that you need to putt nose up, because they see the pro's putting nose up. "you missed cause it was nose down."
Like. do you NOT watch me putt? 90% of my putts are nose down, on purpose.
Putting is a lot easier when you know what the disc will do and all you gotta do is get it on line and let it glide in. And a disc isn't going to "glide in" when its nose up.
Downhill putts are the most fun, cause its a case of essentially figuring out the glide slope to put your disc on and putting the nose angle right.
If we are realistically saying any level of nose up putting at all, were looking at 1 or 2 degree's.
Something that would kill a winged shaped driver, but putters generally do no issues with, which is why they usually fly so good for people who throw nose up like me.