it's a cartoon image of james dolan
First of all, i like SQUARESPACE as a company. They've always been involved with cool stuff and they are regular sponsors to some of my favorite podcasts (YANSS or StarTalk)
Secondly, i'm a bit bummed, the picture posted by Begley shows the same jerseys that we've been used to with while the knicks instagram page shows a slightly different design
https://www.knicksonline.com/news/squarespace-to-become-the-first-sponsor-on-the-knicks-jerseys.html