We've had this argument/discussion before, and just fall on opposite sides of it.
I absolutely believe in the existence of scumslips. This is like mafia RSP, but it's there. All scum, every single scum player in every single game, will at some point make a post that will allow town to catch them. No one is perfect. My definition of a scumslip is "a statement, made by scum, that inadvertently allows town to catch them."
I guess by that definition, you can argue my purposeful scumslip doesn't count. But look at Super Mario -- the speccy picked up on plenty that told them I was scum. Hell, so did Eevee and mcmc. I argued my way out of it. You could call the mistakes in my fake RB claim scumslips, because the people I claimed to have blocked gave me away as scum with too much information.
You (and others) refuse to believe or even consider that scumslips exist. They aren't always egregious, but I believe they absolutely exist.