The OnePlus Nord was released a short while ago and it appears OnePlus has another mid-range smartphone in the pipes. A Snapdragon 690-powered OnePlus phone was spotted a few weeks ago, and a different such offering from the company has once again surfaced on a Geekbench listing.
https://www.notebookcheck.net/OnePlus-Clover-Mysterious-OnePlus-mid-range-phone-makes-a-benchmark-appearance.484217.0.html
Like you said, it's most probably an error. They were going to launch a Snapdragon 690 powered Nord in the US, instead of a SD 765G. I think the 690 has been mistaken for SD 660.
No way they will be able to sell a SD 660 phone in 2020, especially after they disappointed fans with the price of Nord in Europe & US & created so much hype for nothing.