It's the same thing; I assume that timely application of their special sauce is critical, and if you miss it, you've turned your scalp into a giant scab for nothing. So it's a personalized app, with a personalized calendar with the specific dates on which you have to apply the cream.
They can't do that in the US; you might get away with that level of scamming in Mexico or China or wherever Histogen is running their game, but in the US, you are selling a medical procedure, you have to be absolutely clear about the expected outcome. Aside from the FDA, a US physician would never agree to perform the procedure if it was a scam, as they'd be sued and lose their license.
You may be right that it underperforms, but they won't be able to keep that a "secret" and still sell it commercially. It definitely grows hair.
Humans have somewhere between 125 to 200 hairs cm^2, so 25 hairs cm^2 is about 12.5% of a healthy head of hair - that's a lot of hair, and would correlate to more than a single Norwood (if you subscribe to the unciteable claim that hair loss isn't noticeable until 50% of your hair is already gone).