luxchomp 90-10 in your favor??? lolfail
downer lock doesn't work that good against sp, with the (IMO needed) 4 call + 4 DCE they will have a energy to spare.
sacrifice can be sprayed, even with cyrus's initiative.
psychic bind can be sprayed, even with cyrus's initiative.
your opponent is getting free prizes, when you sacrifice.
toxicroak promo loves gigas ko pokes.
gigas doesn't even ko luxray gl lv X.
maybe you should reconsider your matchup? it's more like 60-40 in favor of the luxchomp player.
Have you actually played the matchup? As in experienced Gigas player versus experienced Luxchomp player? Gigas is way faster now with DCE.
Gigas was practically not played by anyone due to the Power Spray SP carries. So why would someone take on Gigas, write an extensive article about it and say it can beat SP deck IF there wasn't an answer for Power Spray in the deck? When doing an important Sacrifice and I know there might be a Power Spray in their hand, I always tend to drop Giratina first. It forces Luxchomp to either spray (and have another in their hand, which is usually overconcentrating the resources which affects the other areas of SP's functionality in general) or pray. It's one of the crucial cards in this matchup, with Cyrus' Initiatives that stop the chaining and can as well stop Luxchomp for good.
Downer lock requires at least 2 energies per pokémon to even attack for reasonable damage. What's better, it requires 2 energies for Promocroak. This means, some Bronzong G action is needed if you want to surprise Promocroak. This is why there is a Mesprit locking going on. If not, well, it will propably get Drag Off'd when it has one energy on it.
Gigas just swarms powers. Sacrifice, SSU, Let loose, Uxies, Psychic Bind. Even with 4 Sprays they will run out pretty fast. When saving your Sprays on your hand, you might just get them discarded via Giga Blaster.
Gigas is a deck which is a do or die on whether your opponent runs out of steam or not. It's really up to the fact that you will have to get Gigas to sacrifice 4 times and still be in the game. In the end game, Gigas draws a prize per turn. Even if you are having Belted Luxray as active which won't get OHKO'd by Gigas without Crobat, it can be just Regice'd to the bench and something else to be KO'd instead.
Due to the fact that Luxchomp is the most played deck at the moment and due to Gigas builds have been mostly rogue until this article, I'd say at least 60-40 for Gigas is perfectly justified, and against most players who will be completely unaware with their netdecked Luxchomps, 90-10 may be just right on the bat. It's not realistic, of course, if both players know what they are doing.
Luxchomp's disruption (sniping, gusting) is also not too useful against Gigas. You will get practically the same result if you just hit Gigas for 80 and force it to Sacrifice than Gusting in something/sniping something and KOing it. The same Gigas will be there waiting for you after you're done, undamaged, as you decided to KO something else, basically leading to the same result. Most of Luxchomp's tool just aren't effective enough vs Gigas as they would be against majority of decks around, due to the fact that you can snipe/gust for first prizes, then get Powerlock'd in the endgame and be forced to just feed the rest of your SPs/Uxies/Azelfs to the Gigas.
Not to mention that Garchomps will be Drag Off'd. That's basically a given when you lay down a Chomp, unless you Unown G them, which means you will be paying 4 energies to snipe in Downer lock. Gross.
I've been extensively testing this matchup due to the fact that Luxchomp is the most played deck around. And it's entirely manageable matchup for Gigas. Gigas just gets it's problems elsewhere, from the areas where Luxchomp may shine in.