No; he not doing it right.
It is physically impossible to get that much wattage out of a 40 amp power supply.
To get 900w out of that radio, you would need a power supply that would put out over 100 amps @18v. In that video - under load (keyed), the power supply showed only 12v. It goes against the laws of physics to see that radio put out 900w. Has to be something wrong with his test setup to get those numbers.
Anyone else see these same faults in that video?
I was being facetious.
I'm not saying he's getting those watts but I'll tell you what he is doing, he's showing you he is in that video and every other video that he's posted of doing that mod. And at 12v I will agree, it just isn't possible but wait, watch it again and the impossible is possible. What could possibly be wrong with a Bird meter to get that, a slug that's out of calibration? Maybe, I don't know. Again, I'm not singing the song of his praises, I'm asking a question as to how it's possible, what is he doing, whether it's wrong or not... what is he doing to get that to show that way?
And in my mind, since it's not possible, when some dude buys that radio and gets it in the mail and it's not putting out anywhere near that power, somebody is gonna be ticked off. Look at his website and see what he charges for that radio, you'll be floored. Someone dropping close to $1500 in a Galaxy 98VHP to find it doesn't do 900 watts PEP, you tell me they won't be seriously disturbed. And if it were me, I'd be on YouTube commenting or posting my own video of how it doesn't perform as stated, yet I don't see that. So again, how's it possible or impossible yet being shown right there in front of your eyes... what's he doing to falsify that reading if that's in fact what he is doing?