UpnCbs06, that edit count is across all of Fandom, not just one wiki.
EmilyHReturns, apparently Mendes2 does have an example but finding them would be hard. There is no centralized way to check each user's edits on each wiki so you pretty much just have to stumble upon such users.
High edit counts are impressive but it should not be confused with the amount of content contributed. Some users make micro edits to intentionally run up their edit count without actually contributing much.
Exactly that. I know of TyBot because it's usually used as an example when talked about high editcounts, and other than that I'm not aware of many others who have amassed more than 100k genuinely constructive edits. Users like the one linked in the first reply have mainly reached that high number by massive nonsense bot page creations, only for the sake of edit count, and not for the sake of the content on the wiki.
If you look at the block reason, it includes creating unnecessary pages. I am not saying they wouldn't have reached 100k without them, but I am willing to bet the unnecessary pages definitely helped get them that edit count.
There's Senvaikis on Lyrics wiki, but they used a lot of scripts on their main account so that doesn't really count. I don't think it's possible to amass a million edits even in 10 years without running a bot script at one time or another.
It will probably take years. However, I have over 445+ edits on Caillou Wiki since I joined on January 22, 2020 and over 480 edits on the ExplodingTNT Wiki since I joined on February 8, 2020. Sometimes, it just takes the quality of edits, errors, more info that needs to be added, and find broken links to pages over time. CaillouFan (talk) - I love the TV show Caillou. 10:53, May 22, 2020 (UTC)
in regards to OPs original question, no human account would have amassed 1 million edits on a SINGLE wiki, and probably never will. it's a terrifyingly high amount and would require years upon years of constant editing, and as Andrew mentioned, not necessary quality edits either. although i do respect people with high edit counts who are actually active and dedicated.
According to Wikipedia, Fandom was founded on October 18, 2004. That means 5,844 days by the time we get to October 18 of this year. In order to reach 1M edits in this period of time (16 years), a user would need to make a bit more than 171 edits per day every day.