Your fourth picture is a bit too dark to tell for sure, but usually there is a tab there to pull back and it’ll slip off.
The other common method is to have tabs that catch the outside of the curved section of the arm, and when the wiper is in-line as it sits on the windshield, those tabs cannot move outward. Rotate the wiper 90 degrees and they are uncovered and can bend outward to clear the curve. I don’t see that on this model though.
What are you replacing with? The ones sold at dealers are not genuine Toyota products.. the original wipers for a 200 are super high quality and you can keep them fresh with new rubber inserts for like $10 each.