It's definitely Bullshit...
This would never happen, but just for fun...
I, as well as any other serious gambler would give you 10 to 1 odds, if you can do the following:
Successfully Pick 70 out of 100 even money bets.
This is much better than the 80% you claim, it is 70%.
It will never happen, but just know you would have a line of people, if you were ever serious about it.
Definitely no shortage of Folks putting their money where their mouth is.
Actually for 1:1 odds, I would go as low as 55/100.