getting in late, but yes, it is mold. you are contaminated with billions of spores, just waiting for the moisture and temp to be right to begin growing.
you need to get that moisture under control. it would also be a good idea to keep your temps a little higher for the next two to four weeks (yeah, you're probably a month from what i consider 'ideal' harvest point). powder mildew prefers (edit due to stonedness)
lower temps, and is very proliferate this time of year due to humidity and cooler temperatures.
i WOULD NOT SPRAY THE BUDS!
@GroErr gave some great and sound advice, and you should do that rather than use chemicals harmful to humans if you do spray. the soap and oil will certainly help inhibit the mildew/mold, but it's molding due to high humidity and transpiration. if you don't get the humidity down, spraying may very well add to your problem as you will be raising humidity, and you will have extra water in your tent.
you may lose some product if it gets in the buds, but you can salvage by making edibles with the contaminated product. the mold won't survive the oven decarb, let alone the butter making process, and the puff/dust/spores are dangerous to your lungs, not your gi tract. if it's already going 'poof' when you touch it, PLEASE WEAR A MASK! any medical or consruction style mask will do, and your lungs and potential longevity will thank you. i'm saying this from a smoker's point of view, lol. take care of the lungs, they are very hard to replace...
i recommend two things, and i would apply both immediately...
1) sacrifice a bit of reflective surface for a drier 'day' period. leave your tent open during lights on so that soil moisture and runoff isn't trapped in a mylar box cooking nasty shit. in addition, do whatever you can to keep your residence 'dry'. don't leave doors and windows open, use the extruder when you take a shower, etc. anything to lower humidity helps, including an expensive to run and buy dehumidifier (which may be necessary in your area, and something to consider for your next grow)
2) check daily for leaves resting on other leaves. the transpiration process removes water as evaporation, but if your leaves are like a stack of blankets, it won't evap, it will condense on the layered leaves and cause mold identical to the pictures you have provided. if necessary (and it looks like it is), selectively remove some of the OLDEST fan leaves, the ones most damaged and/or fading. DO NOT go overboard here, just thin it so it can get air flow and remain dry. think clothesline compared to throwing your clean wet clothes in a basket and leaving them.
hope this helps, i'm tired and stoned, so if this post makes no sense, please disregard, lol.
good luck!
. Good luck, I've only had it on my outdoor plants and it was a losing battle. I get it every year on my zucchini bad