The pic you posted looks a lot like a Mystery / Himodel / Swang ESC to me. I have all three so I have a clue here. They are all the same beast, just a different shrink wrap and decal.
Of the ones that I have and for all the research that I have done on them, I have NEVER seen an instruction to "hold full throttle" while hooking up the battery.

These cheap chinese ESC's are out of the packet "good to go" in my experience.

There are programing methods that include a lot of beeps and tones. I have not used them.

I have one in my test rigger that has cleared 50 mph. This is a 4S setup to a 7XL on a 637 prop.
There is a lot more to come from this hull !!