1. The current NYC signs have arrows indicating directionality of the applicable rules. There are three kinds ( <--, -->, and <-->). Only one of their design example shows this information and it's implementation seems awkward.
2. The current NYC signs are theoretically reproducible and modular. Stacking them one on top of one another makes the driver feel like they are divining tea leaves, but the city might see it as minimizing costs. They can cut a couple hundred "Alternate Side Street Parking" signs for Mon./Wed. 9:30a-10:30a, and put them where they need to. With these signs, you are more likely to have a unique sign for every block.
3. I'm not colorblind, but are the green and red bars they've used colorblind safe? The red stripes are hard for me to see on my monitor, but maybe that is the intention. EDIT: Ah, I see in the infographic, that they've considered colorblindness. Still, the difference in the reds seems pretty subtle.
4. The text size gets increasingly small the more detailed the scheduled is.
EDIT: The relevant section for parking signs from the MUTCD (Manual on Uniform Traffic Control Devices), the USA DOT publication on signs, says this:
Parking signs should display the following information from top to bottom of the sign, in the order listed: A. The restriction or prohibition; B. The times of the day that it is applicable, if not at all hours; and C. The days of the week that it is applicable, if not every day.
If the parking restriction applies to a limited area or zone, the limits of the restriction should be shown by arrows or supplemental plaques. If arrows are used and if the sign is at the end of a parking zone, there should be a single-headed arrow pointing in the direction that the regulation is in effect. If the sign is at an intermediate point in a zone, there should be a double-headed arrow pointing both ways. When a single sign is used at the transition point between two parking zones, it should display a right and left arrow pointing in the direction that the respective restrictions apply.
So overall, it seems that these would be rubbing against the established grain, but perhaps a change like this is needed.