Those snapshots appear out of focus and difficult to see up close where terminals are shown.
Some electrical connectors for single wire connection (not stranded wires) are push-on types where inserting a solid copper wire is slipped into a claw like terminal. Once pushed in, the single jaw prevents pulling the wire out. These terminals may have a pinhole to insert a tool to depress the jaw and allow pulling out the wire. Other terminals have a slotted screw to unscrew to release each wire.