It's more so outdated parroting than deliberate misinformation. A lot of the times I see people trying to back this one up, it's with Hawkins et al.'s Comparative environmental life cycle assessment of conventional and electric vehicles paper. A 2012 study that analyzes emissions based on manufacturing and energy production capabilities of the time doesn't hold up well over a decade later.

You would think that would be obvious, but ¯\_(ツ)_/¯