I'm a stubborn cunt so I tunnel people like crazy and I bite myself in the ass for it at the end of a game... I've been trying to get better with it slowly but it's still tough to get out of the habit, as trusting your gut becomes something incredibly beneficial the more you play. I haven't read the page, but if you want a TL;DR on tunneling, it's being so focused on one person that you don't really pay attention to anything around you and your only focus is getting that person's shit rocked. It's tunnel vision, hence the name.
I'd say deflection is just as often a scum tell in the newbie queue as it is a noob town tell. As you play with more experienced players, you realize that you don't have to prove anything about yourself, and other peoples opinions don't really matter unless you're scum or you're about to get your shit rocked and thrown into a rope. Deflection is just like it sounds; you're boutta get your shit rocked so you go "yo no way fuck this guy rock his shit instead" and you deflect your sus onto him/her/them so you stay alive.
I do agree with a lot of what you said, however I feel like it changes the more you play. In a newbie queue, there are some things that are slightly different and not quite developed yet for some players and I don't want them to think that everything's so black and white in mafia so I'll just leave them with this,
i'd hope newer players know that but it can't hurt to say it louder for the people in the back