OK, that sounds logical...

The regular old two person method done correctly works very well...has for nearly a century.
Brake fluid should be pretty new and shielded from moisture... The power bleeders I have seen use a lot more brake fluid ....
AND if you do not use nitrogen or something like that to power it you have compromised the excess fluid left in the bleeder...
And isn't there usually spillage when disconnecting the power bleeder cap from the MC ?

So the cheapest most boring but PROVEN effective method of bleeding the brakes is the two person method.

I have seen some funky stuff in the brake lines and sometimes real pressure is needed to get it broken loose... but the idea of pressurizing the TOP of the MC reservoir worries me...
The part pressurized when using two people is ONLY that part which is designed to have high pressure applied to it... Sometimes pressure and velocity are helpful for something which has high and low spots in the fluid path.