I have found that people will sell anything that someone else will buy. This also applies to big stores painted blue or orange.I can't believe they can sell pumps with no more information than that. It still doesn't give the max pressure. That is probably a sign that it doesn't make enough pressure, so they don't list it. Again, from that stupid chart, I am GUESSING that pump cannot even build 50 PSI, and the deeper it is to water the less pressure it can build. I would guess pumping from 25' that it cannot even build 40 to shut off a 20/40 switch. So, yes if you want good pressure you will need a good pump. It doesn't have to be a brand name, but needs to show a max pressure of at least 80 PSI. That way it can still be 20' to water and the pump still work with a 40/60 switch. Starting with 40/60 you would still have 20/40 after the filters. But starting with 20/40 you got nothing left after the filters.
I walk through the plumbing department snd shake my head at the garbage plumbing products and gimmicks being sold.
If people would return that crap when it doesn’t work they would stop selling it. But most just throw it in the garbage snd forget about it.