Anything can clog and will clog given enough waste matter and paper. There are some toilets that are more resistent to plugging than others.
The new toilets use 1.6 gallons or less.
The old ones may have been 3.5, 5.0 or even 7.0
And even those old toilets plugged.
That's why every home and plumber owns a plunger.
It's not like the idea of a toilet plugging has ever been a new idea.
No matter what toilet you are plugging, you can use a plunger with fairly good success if you leave water in the bowl.
Water in the bowl helps with the suction that you are attempting to get with the plunger.
The best plungers have an end that is about 2" in diameter. With some you have to pull the small end out, being that they tuck them inside.
With water in the bowl, use very short quick strokes until you see the water vibrating,
When you see the vibration, pull up on the plunger.
Most of the time, the bowl will siphon out when you lift the plunger up and away.
Other methods include pouring a five gallon bucket of water straight into the bowl
Using a closet auger.
Note: I did remove a Toto Ultramax that had been installed by a flooring contractor. The wax ring was blocking the drain.