Yes, it seems that ASN went rogue or something starting on Oct. 2019. Some of my sites also got hit early on, and I quickly put them in check (for now) using CloudFlare's Firewall.
See the Spam statistics report here: https://cleantalk.org/blacklists/as136907
I really appreciate the info provided in this thread, especially the firewall rules for CloudFlare.
For a moment there, I thought I was getting DDOS'ed -- asking myself, how did I piss off the Chinese? Thinking it may have been the known Chinese Censorship DDOS attack being done to sites they dislike.