Vmc is not really bank angle dependent.
Indeed. However, this relates to the certification book Vmc speed.
Operational discussions out in the marketplace on bank and low speed directional control problems need to distinguish between the
(a) AFM Vmc book value (ie the certification animal which is well defined but of little precise value to the GA pilot in the street) and
(b) the rubbery low speed OEI directional control problems in the real world on the day which are sensitive to whatever bank is applied ... we use the term "Vmc" rather loosely and imprecisely in this latter case.
His comment regarding using a tad more bank is a key to delaying a departure early in the low speed OEI recovery.