"The forward rate of reaction = the reverse rate of reaction"
During a reaction of equilibrium the rate of forward and reverse reaction may be different. By terming it as being "at dynamic equilibrium" we have a deeper understanding of the situation. No more products are being made/lost. Rate of forward = rate of reverse.
Chemical Equilibrium refers to the changes in concentrations of reactants/products during the reaction. Therefore at chemical equilibrium, dynamic equilibrium has been reached (NO change in the concentration of reactants/products)