I think the definition of load signal is irrelevant as long as the purpose of the serializer in design and the properties of the receiver aren't considered. The sender may start it's data frame at an arbitray clock edge, but the receiver has to know it. The signal, that tells the frame boundary is usually designated a frame clock.
In my view, the load signal isn't a clock but a qualifier, it has to keep setup and hold constraints related to the clock. This is achieved without extra care, when the load signal is originated from the same clock domain. If no other requirements exist, it may be simply generated by a 0 to 35 bit counter.