Yes, the construction shows how to bisect an angle correctly
How to bisect an angle
In the diagram angle A is bisected by line AE
The bisection is achieved by placing the compass at point D and marking an arc (or drawing circle)
Using point E as center, we use same measure (as used earlier) to mark another arc (or circle)
The intersection of the two arcs (that is point G) is noted
Draw a line from A to cross point G.
Then angle A is bisected to have angle CAG equal to angle BAG