Eh, that's quite a bit of a leap. For one, there's no evidence that the developers are creating content with the intention of it being used. Second, I very much doubt that SE is personally approving all content and strategies included in this "official" site. They paid someone to set it up and run it, but that's probably it.
The strategy exists, but I think it's a bit lame and hope they remove it.
Sorry, you're right, it's not that they're creating content with the intention of it being used... but they are actively telling people to use it. My point earlier was that it's not a glitch or something which should actively be frowned upon, you're told to use it.
As for your other point neither of us have any idea, but if it's on the official site I'm taking that to mean SE and DeNA are fine with us using it, backed up by the fact that they haven't "fixed" it, like they did pretty quickly with the VIT/RES0 trick.
I agree with you though, it's silly and should be taken out of the game. But if we're being prodded in the direction of using it (and at some point who knows, maybe it will be mandatory) then I'm going to keep using it... especially if the alternative is spending money for a chance of picking up good gear.