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Glad this worked out better for you than it did for me. I attempted doing the exact same thing 3 weeks ago. I froze the same large mylar with an air duster can and then tried peeling it up. Instead of coming off nice and clean like yours did, it left all sorts of gunk everywhere, and it also TORE OFF THE PAINT around the three orange lightning bolt inserts in the middle of the pop bumpers. At that point, I had a freakin' conniption. After various attempts to rectify it, I tried hand-painting the white bubbles around the inserts, and then put down several layers of varnish over it. So it's back to looking presentable. But what an ordeal that was.
Do you intend to replace that same mylar piece?
I ordered a replacement mylar, but ended up not using it because I went for a playfield protector instead.