When 28 knots counted as fast for a battleship

Would a 28-knot battleship count as a fast battleship?

Yes for the 1920s and 1930s: about 28 knots is the entry point, although later fast battleships were quicker.

Speed labels are historical categories rather than absolute ones. A 28-knot battleship sits at the entry point for a fast battleship in the 1920s and 1930s, while later designs pushed the category higher. The same speed can imply different operational roles in different design generations. Interwar ships should therefore be judged against contemporary fleets rather than their faster successors.