That TOH magazine article was written by someone who doesn't work in the drywall or plastering business, and is getting his words out of a dictionary that no drywall or plastering contractors use.

What TOH calls a "scuncheon", almost everyone else in the world calls a "return".

Whenever a wall is thicker than the door frame or window frame that's installed in it, you need to finish the exposed interior of the wall in an aesthetically acceptable way, and that's the job of the "return". You can have interior or exterior returns depending on how the window or door is installed.

This is the first time I've ever heard of a return being called a "scuncheon". If you google "scuncheon" you do indeed get a definition that matches a window return. But, teaching people that it's called a "scuncheon" when everyone in the business calls it a "return", is not helpful in my view. Having homeowners using different terminology than the contractors they're trying to deal with makes a difficult situation even harder for all concerned.

Window Returns - Drywall - Contractor Talk

New wood window returns and casing

Window returns with Trim-Tex Super L-bead - Drywall Finishing - Drywall Talk

I didn't look at any of the other pictures because I know that freelance writers will offer articles to DIY magazines to publish. The freelance writer gets paid for his article, but it doesn't mean he knows what he's talking about or that everything in the article is correct. If the freelance writer that wrote that article for TOH Online had spent any time in the drywall or plastering business, he'd call it a return just like everyone else does.

PS:

Here is what Trim-Tex Super L Bead looks like:

http://trim-tex.com/product_images/3710.jpg

If your return is an interior return, then you're going to need a corner bead around the window anyway. Trim-Tex makes the Super L Bead specifically for the the situation where you're installing a window designed for 2X4 stud walls into an exterior wall framed with 2X6 lumber. Window manufacturers will typically offer "trim kits" specifically for that situation so that the return around the window nicely matches the window itself. But Trim Tex makes their Super L bead as a generic return/ corner bead that can be used with anyone's windows.

Trim-Tex makes VINYL drywalling supplies. I LOVE their vinyl corner bead, and I wouldn't install anything else in my building. I'd sooner throw away metal corner bead than install it in my building because in my view, metal corner bead is just a pain in the butt waiting to happen.