My take on this is that most of us are not electrical engineers or physicists, and so we have no idea what is going on in the inner workings of these detectors.
I saw that video, and the logic he uses; one thing I can say is there are reasons he may not be correct -- things he's not considering.
To illustrate...and I have NO IDEA if what I'm about to say is correct, but it COULD be at least loosely correct, and would be something that he is not considering....
Let's say there is 1 Watt of "power" that is "going into the ground" with the EQX, AND with the Manticore, and the FCC is happy. NOW, both units are "simultaneous multifrequency" machines, of course. So they are by definition, it would seem, sending more than one frequency into the ground at the exact same time. So, it would seem to me that if you have 1W to work with, but you are transmitting multiple frequencies simultaneously, it would seem to me that it's at least possible that the way it happens physically is that the 1 W is DIVIDED UP, amongst each of the frequencies that are being simultanously transmitted. SO -- let's say that in the Equinox, there are 3 different frequencies trasmitted, and all three are transmitted SIMULTANEOUSLY (and let's assume they are 5 kHz, 10 kHz, and 15 kHz). In this case, then, it would seem to at least potentially imply that each of the 3 frequencies are transmitted at a power of 1/3 of the total 1 W (.33 W each). Right?
So, now, let's say that to get "50% more power" to the coil, let's pretend that what Minelab did in Manticore is that they are now transmitting 4 different frequencies (let's say 2.5, 5, 10, and 15), but they transmit them only TWO AT A TIME, in rapid succession -- first they transmit 2.5 and 5, simultaneously then they transmit 10 and 15, simultaneously. SO, now, in my speculative scenario, the 1W of power is only divided amongst TWO frequencies, and thus each of the first two frequencies transmitted get 50% of the power each (1/2 W each), and then the SECOND two also get 1/2 W each. SO -- if you then look at it in terms of how much power was EACH INDIVIDUAL frequency transmitted, it is indeed "50% more" with the Manticore (in this hypothetical scenario). The 5 kHz frequency transmission, for example, was getting .33 W of the total 1 W in the hypothetical Equinox I described here, and yet in the hypothetical Manticore, the 5 kHz transmission was using .5 W of the total 1 W. And, .5 W is indeed 50% more than .33 W, even though TOTAL transmit power is still 1 W in both machines.
NOW -- that is ENTIRELY made up; I have no idea if that is what they are doing or how they do it...or even if that's even how "transmit power" works (i.e. divided amongst the number of frequencies being transmitted). But, that is ONE (among other) possibility of how Minelab MAY NOT be lying. All I'm saying is that there are things that we may not know that we are not even aware that we doesn't know, and it's something that looking at the specs, like the gentleman did, would NOT reveal this (in my hypothetical case).
The BOTTOM LINE is that it an outstanding machine, amonst other outstanding machines on the market, and I personally really like it, no matter HOW Minelab's marketing department may spin things. They "spun" things when they released the Equinox, also, saying it would "obsolete" all other detectors. Did it? Not REALLY. But, does that mean it wasn't an incredible, and I'd argue game-changing machine? Of course not. The marketers at Minelab are over-exuberant, but Minelab's development team has always been top notch, in my book.
Steve
