The computer doesn't know that it has a 3.3v line externally boosted to 5v. It doesn't care about that at all.
It can care about how much power is being used, since the upstream 3.3v power supply -- whatever it may consist of -- is a finite thing.
But power is not the same as voltage. A device running from 5v does not necessarily use any more or less power than one that runs from 3.3v does. We don't have enough data to quantitatively know if power consumption is problematic or not for this particular instance, but I very strongly suspect that it is not an important concern here.
Finally, computers (and computer-like things) definitely do care about signal voltage. But USB signalling voltage is the same regardless of supply voltage, with USB 2 working between ~0v at the low end and at most 440mV at the high end, and tolerating up to 3.6v for compatibility with previous versions -- by specification. So that's not an issue.
Tl;dr, it's fine. And the author did a fantastic job of executing this hack very, very cleanly.
I think I myself would have taken the easy route and found a good place to run a bodge wire for 5v, and maybe even stripped the Logitech adapter out of its housing for some good old fashioned soldering fun, but everyone has their own proclivities.
It can care about how much power is being used, since the upstream 3.3v power supply -- whatever it may consist of -- is a finite thing.
But power is not the same as voltage. A device running from 5v does not necessarily use any more or less power than one that runs from 3.3v does. We don't have enough data to quantitatively know if power consumption is problematic or not for this particular instance, but I very strongly suspect that it is not an important concern here.
Finally, computers (and computer-like things) definitely do care about signal voltage. But USB signalling voltage is the same regardless of supply voltage, with USB 2 working between ~0v at the low end and at most 440mV at the high end, and tolerating up to 3.6v for compatibility with previous versions -- by specification. So that's not an issue.
Tl;dr, it's fine. And the author did a fantastic job of executing this hack very, very cleanly.
I think I myself would have taken the easy route and found a good place to run a bodge wire for 5v, and maybe even stripped the Logitech adapter out of its housing for some good old fashioned soldering fun, but everyone has their own proclivities.