It's not showing up for me anymore, and these systems are almost fully automated so it's not a question of manually purging the cache when you spot a mistake, and Google will have multiple caches at key internet nodes all over the world to give quick response times (ever wondered how Google can apparently search the entire internet for your obscure query in a few ms?) which will all be updated at different times depending on usage.
Google (and hence google home, etc) gets nearly all of its 'facts' from Wikipedia (and this is almost explicit by the link to the Wiki page that's displayed at the end of the text), it's not Google answering, it's Google blindly repeating what Wikipedia said the last time the cache was updated.
If you want to actually do some research, find the person that first reported him showing up as president and you can almost guarantee they, or someone they know, editied the Wiki page.
It was on Wikipedia, the edit history of Wikipedia is public, you can view the edit here. It was performed by a user named Qwashere2021 (probably one of your lot).
Google obviously doesn't pull fresh data from Wikipedia for every search because of the load that would place on their servers, it keeps it's own cache and only updates it with the latest changes every few hours, hence it takes a few hours for Google to reflect changes made on Wikipedia. You had obviously checked it after the change had been reverted on Wikipedia but before Google had updated their cache.
Again this is basic research that you've obviously failed to do and instead you've just jumped to a conclusion that supports your existing beliefs, which pretty much sums up the entirety of Q.
Google just pulls the blurb from Wikipedia, Wikipedia can be editied by anyone, someone just edited Grenell's wiki to say he was president. This is not hard or difficult to explain. Do your research.
Sure they did, this place has been alight with people raring to go for yesterday, taking guns, comments about taking the country by force, it'll be 'wild', Minecraft, etc. Then when those words and rhetoric have consequences, and the inevitable happens, you blame it on Antifa. At least own it you pussy.
The negative mark just means the edit removed something from the page, rather than adding something new. This is quite basic stuff, but I understand that a lot of people won't necessarily be aware of it, but is a prime example of why you actually need to do some research before concluding that a wiki page edit is a secret sign from a government insider alluding to a looming military coup to overthrow the current government. As I said previously, the same can be applied to basically every crazy Q fantasy since 2017.
As to how Wikipedia works, anyone can make an account and edit any page (except a few that are locked for repeated vandalism) to say whatever they want. Obviously the edit will be seen by more experienced/power users and quickly reverted if it's obviously false/vandalism so it's unlikely to stay up long and you'll find yourself banned pretty quickly if it's obvious you are being malicious. The edit page and the discussions around them are often more interesting than the page itself though.