What you read is incorrect. You have to try it and see how your system behaves.
If you use an air-bleed type of controller that vents pressure off the sample line, the exhaust side pressure can push the gate open even without boost. With a single waste gate I can run a 10 psi spring and pull the boost sample line all the way off and not get more than 15 psi. At 15 it just pushes the gate open even without signal. A different system or different gate might make 30 or 40 psi. Who knows!
Boost can be all over the place with a bleed type controller, depending on how the gate responds to exhaust pressure trying to push it open.
A CO2 dome pressure adder, which is what I use now, lets me run a 5psi spring and get 30 psi boost via the controller. I normally run a 10 pound spring as the target lowest boost, and apply dome pressure to get the boost wanted. If I slap 18-20 pounds of CO2 on the dome with a 10 lb spring I get 25 psi boost. I can go up to 30 psi boost by applying 25 psi on the dome.
Can't do that even if I yank the compressor line totally off the waste gate because the exhaust just pushes it right open.
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)