That's a block diagram, they don't show the schematic because its their intellectual property.
THEY title it with schematic. Allow me the inaccuracy to do the same. In any case, I would expect the mentioned components listed there, if they WHERE there.
This is a properly rated supply from a reputable supplier with all the relevant safety standards:
"Meet all requirements of UL/CUL60950, EN60950, EN60335, EN61558‐2‐16,CE,VDE, and ENEC Mark"
Safety standards for what? To be a part of a power supply, or to BE a power supply?
The point is you have no defence in law if you use this in a piece of kit you make,
If your 400k€ house burns down, some defense in law for your insurance is a very good thing.
but its way better than using a knock off unsafe chinese USB supply, because it
won't catch fire or electrocute you unless you do something really dumb. A properly
rated external USB supply is going to be the best of all worlds because you don't touch
the mains and its a safe supply.
When someone wants to built a power supply and asks what a MOV is, I dispute that. Of course, YOU can find a less safe supply. But if you go for some at least vaguely reputable manufacturer (I feel those who sell stuff that works with things like quick charge tend to be reasonably engineered) you will be much better off.