Yeah, but that would have never been able to happen it the car traffic had not been reduced.
No, The record-breaking cold weather was from a southward plunge of the jet stream in place to the east of the Rockies. That allowed a pipeline of cold air to dive southward from Canada into parts of the central and eastern United States. (https://weather.com/forecast/regional/news/2020-05-07-mothers-day-weekend-record-cold-snow-bombogenesis-extreme-pattern)
Yeah, but that would have never been able to happen it the car traffic had not been reduced.
That is up to you to prove.