^^ This is true, series increases pressure and parrallel increases flow. I was just pointing out that a statement was made that was incorrect and some might believe it as fact. And just because another is fearful of it gives more credibility to a false statement. Heck I could not bring myself to jump out a plane at altitude but others do it and enjoy something I am fearful of doing myself.
If your sump was inna cellar and you needed more flow to the upstairs tank, parrallel pumps would do you diddley and in this case either getting a pump with more head capabilities or putting an identical pump you might have in the bin in series would accomplish the same results.