Is this save once more because it moved back to Cloudflare?
;; QUESTION SECTION:
;cdn.polyfill.io. IN A
;; ANSWER SECTION:
cdn.polyfill.io. 553 IN CNAME cdn.polyfill.io.cdn.cloudflare.net.
cdn.polyfill.io.cdn.cloudflare.net. 253 IN A 172.67.209.56
cdn.polyfill.io.cdn.cloudflare.net. 253 IN A 104.21.23.55
Or is Cloudflare warning about this and hosting the attack site?
It is still not safe. The new owner is using Cloudflare as a CDN to appear more legitimate, but the responses are still fully controlled by the malicious backend.
This has been the case since the end of February.